Category: Uncategorized

Last updated: March 2026

5.7x28mm vs 9mm: The 5.7mm fires a lighter, faster bullet with less felt recoil and better barrier penetration against soft body armor. The 9mm fires a heavier, slower bullet with proven stopping power, lower ammo cost, and a vastly deeper aftermarket. For most civilian shooters, 9mm is the practical choice — but 5.7mm is worth serious consideration for specific use cases.

Two Rounds, Two Different Design Philosophies

Imagine you’re standing at the counter at White’s Arms and you’ve narrowed your choice to two pistols: a 9mm carry gun or something in 5.7x28mm like the KelTec KP50. The caliber question alone is worth a real conversation. These aren’t interchangeable rounds — they were designed for different purposes and deliver different results.

Let me walk you through what actually matters when comparing these two cartridges for civilian use.

Ballistic Comparison

Specification	5.7x28mm (FN SS197)	9mm (Federal HST 124gr)
Bullet Weight	40 grains	124 grains
Muzzle Velocity (4″ barrel)	~1,650 fps	~1,150 fps
Muzzle Energy	~240 ft-lbs	~364 ft-lbs
Felt Recoil	Very low	Moderate
Expansion (defensive loads)	Limited (small diameter)	Excellent (HST, Gold Dot, etc.)
Penetration (FBI gel)	12–15 inches	12–18 inches (load-dependent)
Ammo Cost (per 50 rounds)	$25–$40	$12–$20
Aftermarket Availability	Limited	Extensive

The Case for 5.7x28mm

Purpose-Built for Low Recoil

FN designed the 5.7mm specifically for low recoil in automatic-fire weapons. That same characteristic makes it pleasant to shoot in semi-auto civilian platforms. If recoil sensitivity is a real concern — for newer shooters, smaller-framed shooters, or anyone recovering from an injury — 5.7mm is easier on the body than 9mm.

Body Armor Penetration

Certain 5.7mm loads (primarily restricted to law enforcement and military) are rated for Level IIIA soft armor penetration. Civilian loads don’t have this rating, but the flat, high-velocity bullet design does offer better performance against hard barriers than a round-nose 9mm.

Capacity in Some Platforms

With the KelTec KP50, you get 50+1 rounds before a reload. No 9mm pistol at the same price offers that capacity. If high round count is your priority and you’re not concerned about carry, this is a genuine advantage.

The Case for 9mm

Stopping Power and Terminal Performance

Modern 9mm defensive loads — Federal HST, Hornady Critical Duty, Speer Gold Dot — are among the best-performing defensive rounds ever tested. The FBI’s standards for penetration and expansion are met or exceeded by premium 9mm loads. The heavier, slower bullet creates reliable wound channels that outperform 5.7mm defensive loads in terminal ballistics testing.

Cost and Availability

9mm is the most widely produced handgun cartridge in the world. You can find it at every gun shop, sporting goods store, and big-box retailer. 5.7x28mm requires specialty stocking and is harder to find during ammo shortages. At the range, shooting 9mm costs roughly 40–50% less per round than 5.7mm — a real consideration if you shoot frequently.

Platform Selection

Want a full-size duty pistol? The S&W M&P9 M2.0 Metal in 9mm. Want the best carry pistol under $1,000? The SIG P365 FUSE Comp in 9mm. The 9mm ecosystem is mature, and you get better holster selection, more training-grade ammo, and more competitive shooting options.

Head-to-Head Scenarios

Scenario	Better Caliber	Why
Everyday concealed carry	9mm	More platform options, proven defensive loads
Home defense (high capacity priority)	5.7x28mm (KP50)	50+1 rounds is hard to beat
New/recoil-sensitive shooter	5.7x28mm	Noticeably lighter recoil
Range shooting on a budget	9mm	50% cheaper per round
Terminal ballistics / defensive performance	9mm	Premium defensive loads are better tested
Competition (high round count)	9mm	Ammo cost and availability

Pros & Cons Summary

5.7x28mm

• ✅ Low recoil — very manageable
• ✅ Flat trajectory
• ✅ Capacity advantage in KP50 platform
• ❌ More expensive ammo
• ❌ Fewer defensive load options
• ❌ Limited platform selection

9mm

• ✅ Proven terminal ballistics
• ✅ Affordable, widely available
• ✅ Enormous platform selection
• ❌ More felt recoil than 5.7mm
• ❌ Lower capacity in conventional pistols

Our Recommendation

For most people, 9mm is the right answer. The ecosystem is mature, the defensive loads are excellent, and the cost-per-round makes regular practice affordable. But if you’re specifically interested in the KP50 platform, the 5.7x28mm argument changes — 50+1 capacity with low recoil in a legal-to-own civilian platform is a genuinely compelling package.

Browse our handgun selection to see both calibers side by side, and feel free to stop by White’s Arms in Salt Lake City if you want to handle both platforms before deciding.

Frequently Asked Questions

Is 5.7x28mm good for self-defense?

Yes, though the defensive load selection is narrower than 9mm. The Speer Gold Dot 5.7mm and FN’s defensive offerings are legitimate defensive rounds. Terminal performance is acceptable, though most ballistic testers prefer premium 9mm for civilian defensive use.

Can I use 9mm magazines in a 5.7mm gun?

No. 5.7x28mm and 9mm have completely different cartridge dimensions and are not cross-compatible in any firearm platform.

Is 5.7x28mm armor-piercing?

Civilian 5.7mm loads are not armor-piercing. SS190 armor-piercing loads are restricted to military and law enforcement. Civilian loads like SS197 and SS195 do not penetrate Level III armor.

Which has less recoil: 5.7mm or 9mm?

5.7x28mm has significantly less felt recoil than 9mm, due to the much lighter bullet weight (40gr vs. 115–147gr). This makes 5.7mm noticeably more comfortable for extended range sessions and for recoil-sensitive shooters.

Last updated: March 2026

The best high-capacity pistols in 2026 include the KelTec KP50 (50+1 in 5.7mm), Glock 18 (reserved for LE), SIG P365 FUSE Comp (17+1 with comp barrel), and S&W M&P9 M2.0 Metal (17+1 with metal frame). For civilian buyers, the KP50 leads on raw capacity, while the SIG and S&W offer better all-around carry and duty performance.

Why High-Capacity Pistols Matter in 2026

The market for high-capacity pistols has never been more competitive. Manufacturers have spent the last decade squeezing more rounds into frames that are increasingly ergonomic, reliable, and optics-ready. Whether you’re a competitive shooter, a home defense buyer, or someone who just wants to spend more time shooting and less time reloading at the range, here are the best options available today.

We’ve handled all of these at White’s Arms in Salt Lake City. Here’s our honest take on each platform.

The Best High-Capacity Pistols — Ranked

1. KelTec KP50 — 50+1 in 5.7x28mm ($899)

Nothing beats the KP50 on capacity for civilian buyers. 50 rounds of 5.7x28mm before a reload is genuinely useful at the range, and the folding platform with B5 grip makes it surprisingly controllable. The Jungle Clip option doubles that to 100 rounds between mag changes.

It’s not a carry gun — the platform is too large. But for home defense, range fun, and collection value, it’s in a category of its own.

• ✅ Best-in-class capacity at this price
• ❌ Not suitable for carry; unusual manual of arms

View KelTec KP50 →

2. SIG Sauer P365 FUSE Comp — 17+1 in 9mm ($949)

The SIG P365 FUSE Comp represents a different vision of high-capacity carry. With 17+1 standard (and 21+1 extended) plus the integrated compensator and ROMEO-X red dot, this is one of the most fully equipped carry pistols at the $1,000 price point. High capacity meets low recoil meets optics-ready design.

• ✅ Carry-optimized with meaningful capacity
• ✅ Factory red dot and comp combo
• ❌ Comp length may limit some holster options

View SIG P365 FUSE Comp →

3. S&W M&P9 M2.0 Metal — 17+1 in 9mm ($949)

The M&P9 M2.0 Metal brings a full-size, metal-frame option to the high-capacity category. 17+1 with a 30oz frame that absorbs recoil better than polymer competitors. The ACRO-cut slide means optics installation without a separate milling visit. For duty and home defense buyers who want a heavier, more refined platform, this is an outstanding choice.

• ✅ Metal frame reduces muzzle flip
• ✅ Factory ACRO optic cut
• ❌ Heavier than polymer alternatives

View S&W M&P9 M2.0 Metal →

4. Glock 17 Gen 5 — 17+1 in 9mm (~$650)

The Glock 17 remains the standard against which full-size 9mm pistols are measured. 17+1 capacity, proven reliability over decades of military and law enforcement use, and the largest aftermarket ecosystem in firearms. If you want the safest, most proven high-capacity option, the G17 is hard to argue with.

• ✅ Proven, industry-standard reliability
• ✅ Enormous aftermarket
• ❌ Polymer frame lacks premium feel of metal-frame competitors

5. FN 509 Tactical — 17+1 in 9mm (~$800)

The FN 509 Tactical brings factory suppressor-readiness and a low-profile optics plate to the high-capacity category. 17+1 with a threaded barrel and an FN-designed suppressor-height sights makes this a premium choice for suppressors owners who also want maximum capacity.

• ✅ Factory suppressor-ready
• ✅ Quality FN trigger
• ❌ Larger grip than most 9mm competitors

6. Beretta APX A1 Full Size — 21+1 in 9mm (~$600)

If maximum 9mm capacity in a full-size pistol is the priority, the Beretta APX A1 Full Size with its 21-round magazines deserves attention at the $600 price point. It’s less refined than the SIG or S&W options but offers excellent value for competition shooters building round count cheaply.

• ✅ 21+1 capacity at budget price
• ❌ Less refined trigger and ergonomics

High-Capacity Pistol Comparison Table

Pistol	Caliber	Capacity	Price	Best For
KelTec KP50	5.7x28mm	50+1	$899	Range, home defense
SIG P365 FUSE Comp	9mm	17+1 (21+1 ext)	$949	Carry, all-around
S&W M&P9 M2.0 Metal	9mm	17+1	$949	Duty, home defense
Glock 17 Gen 5	9mm	17+1	~$650	General purpose
FN 509 Tactical	9mm	17+1	~$800	Suppressor use
Beretta APX A1 Full	9mm	21+1	~$600	Budget, competition

How to Choose the Right One

Here’s the honest breakdown:

• If you want maximum capacity and don’t need to carry: KelTec KP50
• If you want high capacity + carry capability: SIG P365 FUSE Comp
• If you want duty-grade reliability with a premium feel: S&W M&P9 M2.0 Metal
• If you want value and proven track record: Glock 17 Gen 5

Browse our full handgun selection and semi-auto pistols category for current inventory.

Frequently Asked Questions

What is considered “high capacity” for a pistol?

Typically, any magazine holding more than 10 rounds is considered “high capacity” for legal and regulatory purposes in many states. Industry-standard full-size 9mm pistols hold 15–17 rounds; anything above 20 is genuinely high capacity.

Are high-capacity magazines legal in all states?

No. California, Colorado, Connecticut, Hawaii, Maryland, Massachusetts, New Jersey, New York, and Washington state all restrict magazine capacity (typically to 10 rounds). Check your local laws before purchasing.

Does more rounds mean less reliability?

Not necessarily, but higher-capacity magazines can have more failure points. Quality double-stack and drum magazines from reputable manufacturers are reliable. Cheap aftermarket high-cap mags are where reliability issues tend to emerge.

Which high-capacity pistol has the best trigger?

The S&W M&P9 M2.0 Metal and SIG P365 FUSE Comp both have excellent factory triggers. The M&P trigger with its flat-face design is especially popular for competition use. The Glock trigger is functional but typically benefits from aftermarket work.

Last updated: March 2026

The KelTec KP50 has an MSRP of $899. Street prices in 2026 typically range from $849 to $949 depending on the dealer and availability. Used examples sell for $700–$850 in good condition. If you’re seeing prices above $950, that’s above market — you can do better.

KelTec KP50 Price Overview

Let’s talk about what you should actually expect to pay for a KP50 in 2026. KelTec set the MSRP at $899, and for a pistol with 50+1 capacity in 5.7x28mm — made in the USA — that’s a fair price. But MSRP isn’t always what you pay, and it’s worth understanding how pricing moves in the current market.

New KP50 Price Breakdown

Source	Typical Price Range	Notes
MSRP (KelTec official)	$899	Manufacturer suggested price
Authorized dealers (new)	$849–$949	Varies by dealer margin and location
Online dealers (transfer required)	$830–$900	Add $25–$50 FFL transfer fee
Used / private party	$700–$850	Condition-dependent
Gun shows	$850–$1,000+	Often priced higher; negotiate

Is the KP50 Worth $899?

That depends on what you’re comparing it to. Within the 5.7x28mm category, the Ruger-57 runs about $649, and the FN Five-seveN is $1,400+. The KP50 sits in the middle, and at $899, it offers something neither competitor can: 50+1 capacity in a folding platform.

If you’re comparing to 9mm pistols, $899 gets you a lot elsewhere — including the SIG P365 FUSE Comp with ROMEO-X red dot at $949 or the S&W M&P9 M2.0 Metal at $949. But the KP50 is a uniquely specialized product — you’re not really choosing between it and a carry pistol. You’re choosing it because you want what only it offers.

What Affects KP50 Pricing?

Supply and Demand

KelTec is known for producing interesting firearms in relatively modest quantities. When demand spikes — after a review goes viral or during times of high market demand — prices rise. The KP50 is not always in abundant supply, which keeps street prices close to MSRP.

Geographic Restrictions

In states with magazine capacity restrictions, the KP50’s 50-round standard magazine makes it difficult or impossible to sell. This limits the market and can affect pricing regionally. In states where it’s fully legal (Utah, Arizona, Texas, etc.), you’ll find more inventory and better prices.

FFL Transfer Costs

When buying online, remember to add the FFL transfer fee at your local dealer — typically $25–$50. This brings the effective price of an $830 online deal closer to $870, at which point buying locally from a dealer like us may be equal or cheaper when you factor in customer service and the ability to hold the gun before you buy.

Used KP50 Pricing: What to Look For

A used KP50 in good condition should go for $700–$850. When evaluating a used KP50, check:

• Barrel condition — any pitting or erosion near the muzzle?
• Feed ramp — should be smooth and free of burrs
• Magazine function — test with the actual magazine; 50-round mags can develop feed issues if improperly stored
• Trigger function — check for proper reset and consistent pull
• Folding mechanism — should lock positively both open and closed

Avoid any used KP50 priced at full MSRP or above — you’re better off buying new with a warranty.

What’s Included at $899

• KelTec KP50 pistol
• One 50-round magazine
• B5 Systems grip
• Thread protector (for threaded barrel)
• KelTec documentation and warranty

Notably, the Jungle Clip (100-round linked mag accessory) is sold separately — typically $35–$45.

Price vs. Competitors

Pistol	Caliber	Capacity	Price (approx.)
KelTec KP50	5.7x28mm	50+1	$899
Ruger-57	5.7x28mm	20+1	~$649
FN Five-seveN	5.7x28mm	20+1	~$1,400
S&W M&P9 M2.0 Metal	9mm	17+1	$949
SIG P365 FUSE Comp	9mm	17+1	$949

Pros & Cons of Buying at $899

• ✅ Competitive for the unique capacity it offers
• ✅ American-made, with KelTec’s warranty
• ✅ No other 5.7mm pistol offers 50+1 at this price
• ❌ More expensive than traditional-format 5.7mm competitors
• ❌ Ammo cost (5.7x28mm) adds up faster than 9mm
• ❌ Limited to one magazine in the box — buy spares

Where to Buy

We carry the KelTec KP50 at White’s Arms in Salt Lake City, UT. Check our product page for current pricing and availability. We’re an authorized KelTec dealer and back every sale with hands-on customer support. Browse our full handgun inventory for alternatives.

Frequently Asked Questions

Why is the KP50 sometimes hard to find in stock?

KelTec produces innovative firearms but in smaller volumes than major manufacturers like S&W or Glock. High demand and limited production runs mean the KP50 sells out periodically. We recommend ordering when you see it in stock rather than waiting.

Is $899 a good price for the KP50?

Yes, at or near MSRP is fair market value. Anything over $950 for a new KP50 is above market — look elsewhere. Prices fluctuate, so check availability before assuming a “good deal” is accurate.

Do I need to pay sales tax when buying online?

Yes. Online firearms sales are subject to state sales tax at the transfer FFL location. The transfer fee is also additional. Factor these into your total cost comparison.

Can I negotiate the price at a gun store?

It depends on the dealer. On high-demand items like the KP50, margins are often slim. However, buying multiple items, paying cash, or being a returning customer sometimes opens the door to a small discount. It never hurts to ask respectfully.

Last updated: March 2026

The best KelTec KP50 upgrades include a quality suppressor for the threaded barrel, a red dot optic on the Picatinny rail, an upgraded trigger, and the Jungle Clip for 100-round capacity. Most owners focus on optics and suppressors first — here’s what’s worth your money.

What the KP50 Needs Out of the Box

The KelTec KP50 is an unusual platform, and its upgrade path is equally unconventional. Unlike a Glock or M&P where the aftermarket is enormous, the KP50 has a smaller — but growing — selection of meaningful improvements. Here’s what experienced KP50 owners actually add, and why.

Top KelTec KP50 Upgrades & Mods

1. Red Dot Optic (Highest Priority)

The KP50 ships with a Picatinny rail on top, ready for a red dot or low-powered variable optic (LPVO). This is the single most impactful upgrade you can make. With an 8-inch barrel and the sight radius available, a quality red dot transforms this into a surprisingly precise platform at 50+ yards.

Top picks for the KP50 rail:

• Trijicon MRO — Robust, parallax-free, works perfectly on the KP50 rail
• Holosun 510C — Large window, solar backup, excellent value
• Primary Arms SLx 1-6x LPVO — For precision shooting past 50 yards

2. Suppressor (If You Have an NFA Trust)

The KP50 ships with a threaded barrel — suppressor-ready from the factory. The 5.7x28mm cartridge is subsonic-compatible when you load subsonic ammo, and suppressed shooting with this platform is genuinely pleasant. Popular cans for the KP50 include the SilencerCo Osprey 45 (direct thread adapter) and the Dead Air Mask.

Note: Suppressors require NFA registration ($200 tax stamp), so this is a long-term investment. But if you’re a suppressor owner already, the KP50 is a natural fit.

3. Trigger Job / Aftermarket Trigger

The factory KP50 trigger is functional but has room for improvement. A lighter trigger pull and crisper reset make rapid fire more enjoyable. Geissele and a handful of custom gunsmiths have worked on the KP50’s trigger group. Polishing the factory trigger is a free DIY option that many owners report improves pull feel noticeably.

4. KelTec Jungle Clip

The Jungle Clip is KelTec’s own accessory — it links two 50-round KP50 magazines together for 100-round capacity. It’s a range accessory, not a tactical tool, but it’s specifically designed for the KP50 and feeds reliably when both mags are properly seated. Available directly from KelTec and from dealers like us.

5. Grip Tape / Grip Enhancement

The B5 Systems grip on the KP50 is decent, but adding grip tape (Talon Grips makes a KP50-specific product) improves purchase significantly, especially in wet or sweaty conditions. This is a $15–$25 upgrade with real-world impact.

6. Sling Attachment Points

Given the KP50’s size, a single-point or two-point sling is a practical addition for range carry and home defense use. The KP50 has sling attachment points — a quality sling like the Blue Force Gear VCAS keeps the gun accessible without wearing out your arm.

7. Extended Picatinny Rail Covers

The bottom rail on the KP50 accepts standard accessories — a weapon light like the SureFire X300 or Streamlight TLR-1 adds practical utility for home defense. Cover unused rail sections with standard Picatinny rail covers to protect the rail and improve grip texture.

8. Spare Magazines

Not a “mod” exactly, but a critical purchase — get at least two additional 50-round magazines. At the range, you’ll go through ammo fast and want to minimize reload time. The Jungle Clip requires two identical mags.

Upgrade Priority Table

Upgrade	Priority	Approx. Cost	Impact
Red dot optic	🔴 High	$150–$600	Accuracy, target acquisition
Suppressor	🟡 Medium	$500–$1,200 + stamp	Hearing protection, fun factor
Trigger polish	🟡 Medium	Free–$100	Better pull, faster follow-up
Jungle Clip	🟢 Nice to have	~$40	100-round capacity
Grip tape	🟢 Nice to have	$15–$25	Better grip in all conditions
Weapon light	🟡 Medium	$80–$250	Home defense utility
Sling	🟢 Nice to have	$30–$80	Range carry comfort

Pros & Cons of Upgrading the KP50

• ✅ Picatinny rail ready for optics out of the box
• ✅ Threaded barrel means suppressor-ready immediately
• ✅ KelTec offers first-party accessories (Jungle Clip)
• ❌ Smaller aftermarket than Glock/M&P platforms
• ❌ Trigger aftermarket is limited
• ❌ Some mods require professional gunsmith work

Comparing the KP50 to Other Platforms You Might Upgrade

If you enjoy building out and modifying pistols, platforms like the S&W M&P9 M2.0 Metal have a vastly deeper aftermarket. Triggers, sights, barrels, grip modules — the ecosystem is far larger. The KP50 is specialized, and its upgrade path reflects that.

For those interested in a platform that’s optics-ready from the factory with an existing ACRO cut, the M&P9 M2.0 Metal ACRO comes pre-milled for the Aimpoint ACRO optic. Browse our full handgun selection to compare options.

Frequently Asked Questions

Can I put a Glock-style trigger in the KP50?

No — the KP50 uses a completely different trigger mechanism. Glock trigger upgrades are not compatible. Look for KP50-specific trigger work from gunsmiths experienced with KelTec platforms.

What red dot fits the KP50 Picatinny rail?

Any red dot with a standard Picatinny/MIL-STD-1913 mount will work. The Holosun 510C, Trijicon MRO, and Vortex Crossfire Red Dot all mount cleanly. Make sure to choose a mount height compatible with the KP50’s sight picture.

Does the KP50 suppressor thread come from the factory?

Yes. The KP50 ships with a threaded 8-inch barrel (thread pitch: 1/2×28). The thread protector is included. Simply remove the protector, add your suppressor adapter if needed, and attach your can.

Is the KelTec Jungle Clip worth buying?

For range use, yes — it’s fun and genuinely works. For home defense, a single 50-round magazine is more than sufficient. The Jungle Clip is a range toy that the platform was designed to accommodate.

Last updated: March 2026

Finding a good holster for the KelTec KP50 takes some searching — its unusual shape and 8-inch barrel rule out most conventional options. In 2026, your best bets are Safariland custom-fit options, nylon universal shoulder rigs, and KelTec’s own accessories. Here’s what’s actually available and what works.

Why KP50 Holsters Are Hard to Find

The KelTec KP50 is not a conventional pistol, so it doesn’t fit conventional holsters. The bottom-insert magazine, the 8-inch barrel, and the folding chassis all create challenges for holster makers. That said, the aftermarket has grown since the KP50 launched, and there are now several legitimate options worth considering.

Before we dig in: if you’re hoping to carry the KP50 concealed on your hip, that’s going to be a challenge. At 18.5 inches unfolded (and 10 inches folded), this is a range and home defense platform, not a carry gun. Most KP50 “holsters” are really retention rigs, cases, or shoulder carry solutions.

Top KelTec KP50 Holster Options in 2026

1. Safariland Model 6354DO (Custom Fit)

Safariland’s ALS (Automatic Locking System) holsters are available in custom configurations for unusual firearms. The KP50 falls outside their standard catalog, but Safariland’s custom shop has produced fits for it. If you want professional-grade retention for home or professional use, this is the direction to explore. Cost runs $120–$180 for custom work.

2. Uncle Mike’s Size 16 Flap Holster

For a budget option, Uncle Mike’s large-frame nylon holsters can accommodate the KP50 in its folded configuration. Not ideal for any sort of quick access, but works for range transport and has a retention strap. Around $20–$30.

3. KelTec Accessories / Factory Options

KelTec has offered accessories through their own store and through authorized dealers. Check with our team at White’s Arms — we occasionally have KelTec-brand carrying solutions in stock alongside the KP50 itself.

4. Shoulder Rig / Chest Carry Solutions

For outdoor use — hunting, hiking, or backcountry activities — a chest carry rig or shoulder holster designed for large pistols can work with the KP50 in folded configuration. Galco’s shoulder systems and chest holsters from BlackHawk accommodate oversize platforms and may fit the folded KP50 with adjustment.

5. Custom Kydex (Etsy / Local Makers)

The KP50 has a small but passionate fan base, and custom Kydex makers have taken note. Searching Etsy or local Kydex smiths for “KP50 holster” will turn up options that are purpose-built for the platform. Quality varies, so check for retention, trigger coverage, and material thickness (minimum 0.093″ Kydex).

6. Tactical Range Bag / Transport Case

Honestly, for most KP50 owners, the best “carry solution” is a quality tactical range bag. The Savior Equipment ORCA series accommodates the KP50 with room for magazines and accessories. If you’re transporting it to and from the range, this is the practical answer.

Specs to Keep in Mind When Holster Shopping

KP50 Dimension	Measurement
Overall Length (unfolded)	18.5 inches
Overall Length (folded)	10 inches
Barrel Length	8 inches
Height	~7 inches with magazine
Width	~2.5 inches

What to Look for in a KP50 Carry Solution

• Trigger coverage — Any holster must fully cover the trigger guard. No exceptions.
• Retention — Passive friction or active retention (ALS, thumb break) to prevent the gun from falling out.
• Compatibility with folded position — Most carry solutions work with the KP50 folded.
• Material durability — Kydex or hard polymer for structured retention; quality nylon for flexible carry.

Pros & Cons of Each Option

Option	Pros	Cons
Safariland Custom	Best retention, professional grade	Expensive, requires custom order
Uncle Mike’s Nylon	Cheap, available now	No retention, loose fit
Custom Kydex	Purpose-built fit	Quality varies by maker
Chest Rig	Good for outdoors	Bulky, slow draw
Tactical Range Bag	Most practical for range use	Not a carry solution

Other High-Capacity Pistols With Better Holster Selection

If holster availability is a priority for you, it’s worth knowing that other high-capacity pistols have much better aftermarket support. The SIG P365 FUSE Comp and S&W M&P9 M2.0 Metal have dozens of holster options from every major manufacturer. The KP50 is a specialized platform — know that going in.

Browse our full selection of handguns if you’re still deciding on a platform.

Frequently Asked Questions

Is there an OWB holster for the KelTec KP50?

Standard OWB holsters don’t fit the KP50 due to its size and shape. Custom Kydex makers on Etsy and Safariland’s custom shop are your best options for an OWB-style setup.

Can the KP50 be carried concealed?

Not practically. Even folded at 10 inches, it’s too large for typical concealed carry. It’s a home defense and range firearm, not a carry gun.

What’s the best way to transport the KP50 to the range?

A quality tactical range bag or a pistol case designed for oversized firearms works well. Make sure it has magazine storage — you’ll want to bring multiple 50-round mags.

Are there any holsters made specifically for the KP50?

A small number of custom Kydex makers produce purpose-built KP50 holsters. Search “KP50 holster” on Etsy or firearms-focused custom Kydex shops. KelTec periodically updates their accessories lineup as well.

Last updated: March 2026

The KelTec KP50 and Ruger-57 are both 5.7x28mm pistols, but they serve different buyers. The KP50 offers 50+1 capacity and a folding platform for $899, while the Ruger-57 gives you a more traditional pistol feel and better ergonomics at around $649. For most shooters, the Ruger-57 wins on practicality — but the KP50 wins on sheer capacity.

Two Very Different Visions of the 5.7mm Pistol

When FN introduced the 5.7x28mm cartridge in the 1990s, they designed it for military and law enforcement. Decades later, civilian shooters have access to a growing number of 5.7mm pistols — and two of the most talked-about are the KelTec KP50 and the Ruger-57.

I’ve spent time with both platforms, and let me tell you upfront: these are not interchangeable products. They appeal to different people for genuinely different reasons. Here’s the full breakdown.

Side-by-Side Specs Comparison

Specification	KelTec KP50	Ruger-57
Caliber	5.7x28mm	5.7x28mm
Capacity	50+1	20+1
Barrel Length	8 inches	4.94 inches
Overall Length	18.5″ / 10″ folded	8.65 inches
Weight (unloaded)	~3.5 lbs	~24 oz
Frame	Polymer + B5 grip	Polymer
Action	Semi-auto, delayed blowback	Semi-auto, internal hammer
Optics Ready	Yes (Picatinny)	Yes (Picatinny)
Threaded Barrel	Yes	Optional
Foldable	Yes	No
MSRP	$899	~$649
Made In	USA	USA

Ergonomics & Handling

Ruger-57: The Conventional Winner

The Ruger-57 feels like a pistol. It’s shaped like one, it handles like one, and if you’ve shot any polymer-frame semi-auto before, the learning curve is minimal. The grip is a bit taller than average due to the long 5.7mm round, but Ruger built in grip texture that most shooters find comfortable. Trigger pull is smooth for a factory gun.

KelTec KP50: The Unconventional One

The KP50 has a unique manual of arms. Bottom-insert magazine, a folding chassis, and an 8-inch barrel all combine for something that takes getting used to. It’s not harder to shoot well — it’s just different. Once you’re comfortable with it, accuracy at 25+ yards is genuinely impressive thanks to that longer sight radius.

Accuracy & Performance at the Range

At 15 yards, both guns are accurate. The KP50’s 8-inch barrel provides higher velocity and a longer sight radius — if you’re shooting at distance, it has a meaningful edge. At typical defensive distances (7–15 yards), the Ruger-57 performs just as well and feels more controllable in a traditional grip.

Recoil on both is light. The 5.7x28mm is known for low recoil, and both platforms capitalize on that. Where they differ is in how that recoil impulse feels — the Ruger is snappier but manageable, the KP50 is more controlled with its longer, heavier chassis.

The Capacity Question

50+1 vs. 20+1. This is the elephant in the room. The KP50’s 50-round magazine is legitimately useful for range sessions — less reloading, more shooting. For home defense, many buyers feel 20+1 in the Ruger is more than enough. And with the Jungle Clip, the KP50 can link two 50-round mags for 100 rounds total.

Both guns are covered under magazine capacity restrictions in several states. Check your local laws before buying either platform.

Who Should Buy Which?

Choose the KelTec KP50 if…	Choose the Ruger-57 if…
You want maximum capacity in a 5.7mm platform	You want a traditional pistol feel
You enjoy unusual, conversation-starting firearms	You’re budget-conscious ($250 cheaper)
Home defense with a long-gun feel	You want a more conventional holster draw
Suppressor-ready shooting is a priority	Your state limits magazine capacity

Pros & Cons

KelTec KP50

• ✅ 50+1 capacity — best in class for 5.7mm
• ✅ Foldable and suppressor-ready
• ✅ Longer barrel for better velocity
• ❌ Unusual manual of arms requires practice
• ❌ Not a carry pistol
• ❌ $250 more than the Ruger

Ruger-57

• ✅ Traditional pistol ergonomics
• ✅ Better value at ~$649
• ✅ More carry-friendly size
• ❌ Only 20+1 capacity
• ❌ Shorter barrel = slightly lower velocity

Our Pick

For a first 5.7mm pistol, the Ruger-57 is the easier recommendation — it’s more affordable and easier to learn. But if you’re adding to an existing 5.7mm collection, or you specifically want the highest-capacity 5.7mm pistol available at this price, the KelTec KP50 is hard to argue against.

We also carry a range of other high-capacity handguns — browse our full handgun selection or check the semi-auto pistol category for more options.

Frequently Asked Questions

Is the KelTec KP50 more accurate than the Ruger-57?

At distance, the KP50’s 8-inch barrel gives it a velocity and sight-radius advantage. At typical pistol ranges (15–25 yards), both guns are more accurate than the average shooter can fully exploit.

Which gun has better aftermarket support?

The Ruger-57 has a larger aftermarket at this point — more holster options, more trigger upgrade kits, and better availability. The KP50 is newer and the aftermarket is still developing.

Can I use the same ammo in both guns?

Yes — both chamber standard 5.7x28mm. FN SS195, SS197, and Speer Gold Dot 5.7mm all work in both platforms.

Is 5.7x28mm good for home defense?

Yes. The round offers flat trajectory, low recoil, and good penetration. Defensive loads like the Speer Gold Dot 5.7mm are specifically designed for this use case. Both the KP50 and Ruger-57 are capable home defense platforms.

Last updated: March 2026

The KelTec KP50 is a 5.7x28mm semi-automatic pistol with a 50+1 round capacity, currently priced at $899 at White’s Arms in Salt Lake City. It features a bottom-insert drop-free magazine, B5 grip, and foldable design — making it one of the most distinctive high-capacity pistols on the market today.

What Is the KelTec KP50?

Walk into our shop and ask about the KP50, and you’ll probably get a crowd gathering around the display case. This pistol turns heads — not just because of its futuristic silhouette, but because that 50-round magazine capacity is genuinely unlike anything else you’ll hold in a pistol-caliber platform at this price point.

KelTec built the KP50 around the 5.7x28mm cartridge, the same round used in the FN Five-seveN and the PS90 PDW. It’s a flat-shooting, low-recoil round that punches well above its physical size. Pair that with a 50-round flush-fit magazine and a polymer frame with a B5 Systems grip, and you’ve got something genuinely interesting.

We’ve sold quite a few of these at White’s Arms, and the questions are always the same: Is it reliable? Is it worth the price? And what on earth do you do with 50 rounds in a handgun? Let me answer all of those.

KelTec KP50 Full Specs

Specification	Detail
Caliber	5.7x28mm
Capacity	50+1 rounds
Action	Semi-automatic, delayed blowback
Barrel Length	8 inches (with suppressor threading)
Overall Length	18.5 inches (unfolded), 10 inches (folded)
Weight (unloaded)	Approx. 3.5 lbs
Frame Material	Polymer with B5 Systems grip
Magazine Type	Bottom-insert, drop-free
Folding Stock	Yes — folds for compact carry
Jungle Clip Compatible	Yes — links two mags for 100 rounds
MSRP	$899
Made In	USA (Cocoa, FL)

Design & Ergonomics

The KP50’s most noticeable design feature is that bottom-insert magazine — it loads from directly below the trigger group, similar to a traditional SMG layout. It’s unusual, but it works. Drop-free is reliable in testing, and the B5 grip gives you a lot of control over a platform that, let’s be honest, looks a bit like a prop from a sci-fi film.

The folding capability is genuinely useful. Fold it up and it’s compact enough to fit in a backpack or a larger range bag. Unfold it and you’ve got a stable, manageable shooting platform. The 8-inch threaded barrel adds suppressor compatibility for those who want to run it that way.

Shooting the KP50: Range Experience

The 5.7x28mm cartridge is low-recoil by design. Through the KP50’s longer barrel compared to pistols like the FN Five-seveN, you get good velocity and flat performance. Follow-up shots are easy, and managing 50 rounds in a controlled shooting session is honestly a lot of fun.

The delayed blowback action keeps things smooth. We’ve run several hundred rounds through our demo unit without a malfunction, using standard FN-manufactured 5.7 ammunition. KelTec recommends quality factory ammo for reliability, which is standard advice for any 5.7 platform.

If you’re comparing the KP50 to other high-capacity pistols, you’ll want to check out our KelTec KP50 product page for current availability and pricing.

Who Is the KP50 For?

This isn’t a concealed carry gun — that 18.5-inch unfolded length makes it a range toy, a home defense option, or a collector’s piece. Here’s who tends to buy it:

• Range enthusiasts who want something genuinely different and conversation-starting
• 5.7x28mm fans who already have an FN PS90 or Five-seveN and want a companion piece
• Home defense buyers who want high capacity and low recoil in a stabilized platform
• Collectors who appreciate KelTec’s history of unusual, innovative designs

Pros & Cons

✅ Pros	❌ Cons
50+1 round capacity is unmatched at this price	5.7x28mm ammo costs more than 9mm
Low recoil — easy on newer shooters	Not suitable for concealed carry
Jungle Clip doubles capacity to 100 rounds	Unusual manual of arms takes practice
Foldable for compact storage	Limited holster options
Threaded barrel suppressor-ready	Front-heavy when fully loaded
Made in the USA	Polarizing aesthetics

KP50 vs. The Competition

The KP50’s main 5.7mm competitor is the Ruger-57 at around $649. The Ruger offers a more traditional pistol layout and better ergonomics for most hands, but you sacrifice the 50-round capacity. If you want more than 20 rounds in a 5.7mm pistol, the KP50 is the only game in town at this price point.

You might also consider the SIG P365 FUSE Comp if you’re set on a high-performance pistol but want something more carry-friendly in 9mm, or the S&W M&P9 M2.0 Metal for a full-size duty-style option.

Safety Considerations

At White’s Arms, we always emphasize safe handling. The KP50 has a manual safety and a trigger safety. With 50 rounds on board, it’s critical to be intentional about muzzle direction and trigger discipline. We strongly recommend new owners take a basic firearms safety course before heading to the range. The KP50’s unusual form factor means the manual of arms is different from a conventional pistol — know your controls before you load.

Where to Buy the KelTec KP50

We carry the KP50 at White’s Arms in Salt Lake City, UT. You can check current availability and order online through our KelTec KP50 product page. At $899, it’s priced competitively for what you’re getting: a genuine 50-round, American-made, 5.7x28mm pistol platform that’s hard to find elsewhere.

Frequently Asked Questions

Is the KelTec KP50 legal in all states?

The KP50 may be restricted in states with magazine capacity limits (California, New York, Colorado, etc.). Always check your local laws before purchasing. The standard 50-round magazine exceeds limits in many jurisdictions. Compliant-capacity magazines may be available from third parties.

What ammo does the KP50 use?

The KP50 chambers 5.7x28mm. FN-manufactured loads (SS195, SS197) are the most widely available. Speer and Elite Ammunition also produce 5.7x28mm rounds. Avoid steel-case ammunition for best reliability.

Can you use the KP50 for home defense?

Yes — many buyers do. The low recoil, high capacity, and stabilizing folding design make it manageable in high-stress situations. Overpenetration is a consideration; use quality defensive loads designed for the caliber.

What is the Jungle Clip?

The Jungle Clip is an accessory that links two 50-round magazines together end-to-end, giving you 100 rounds before a reload. It’s a range toy and a conversation piece — not a serious tactical accessory, but undeniably entertaining.

Is the KP50 reliable?

Generally yes, with quality factory ammunition. Like all KelTec products, initial reliability improved as the platform matured. Current production units have a solid track record with FN and Speer 5.7mm loads.

Welcome to WordPress. This is your first post. Edit or delete it, then start writing!