Overview

The Rare Breed FRT-MR3 Flat Forced Reset Trigger for HK MR223/MR556 is a trigger / fire-control part made to fit the HK MR223/MR556.

Check the fit against your exact model and generation before ordering; fitting and test-firing by a qualified gunsmith is always a good idea for barrels, slides and fire-control parts.

Parts and accessories like this ship to your door where the law allows. Unused items in their original packaging can be returned within 30 days of delivery.

Specifications

Specifications come from the product listing. Check them against your own needs before you order, and ask us if anything is unclear.

About the Rare Breed FRT-MR3 Flat Forced Reset Trigger for HK MR223/MR556

Need a reliable trigger upgrade for your AR platform? The FRT-MR3 (FLAT) delivers precise performance for tactical and precision shooting applications. The FRT-MR3 (FLAT) is a high-performance trigger designed for AR-15/M16 platforms. Built for durability and precision, this trigger ensures consistent performance under any conditions.

18 years in the firearms industry, certified armorer, 500+ builds.

Last updated: May 2026

Pros & Cons

• Precision CNC machining for consistent performance
• Black nitride finish enhances durability
• Drop-in design simplifies installation
• Compatible with AR-15/M16 platforms
• Made in the USA
• Higher price point — but worth every penny for quality

Trust Signals

Discreet packaging
30-day returns

Browse more: Triggers | Full Shop

About this review + "Last updated: May 2026"

Shipping, returns and FFL transfer

• Parts and accessories ship to your door where state and local law allow.
• Shipping is $29.99 per order, free on orders over $999. Orders usually leave within 1–3 business days after payment clears.
• Unused items in original packaging can be returned within 30 days of delivery.

Full terms: shipping and FFL transfers · returns and refunds · FAQ · contact us.

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