About the Rare Breed FRT-MR3 Single-Stage

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 represents a precision-engineered upgrade for discerning shooters who demand enhanced cycling control from their HK-pattern rifles. Manufactured by Rare Breed, a recognized leader in trigger innovation, this drop-in component brings forced-reset technology to the MR223 and MR556 platforms without requiring permanent modifications to your firearm. Designed for users who understand the mechanical advantages of a forced-reset system, the FRT-MR3™ delivers a consistent, repeatable trigger pull across its three selectable positions, making it a direct replacement for your factory trigger group.

Overview

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is built around Rare Breed's proven forced-reset mechanism, which uses the bolt carrier's forward travel to actively reset the trigger sear. This design reduces the shooter's need for a full manual finger release between shots, allowing for a faster and more predictable cadence. The three-position selector provides standard semi-automatic fire in position 1, a forced-reset mode in position 2 that enables rapid follow-up shots, and a safe position in position 3. Each position is clearly detented and tactile, ensuring positive selection even under stress. The trigger housing is constructed from billet 7075-T6 aluminum with a hard-coat anodized finish, matching the durability requirements of the HK platform.

Features & Specs

• Three-Position Selector: Safe, semi-automatic, and forced-reset mode. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 allows the shooter to choose between standard operation and the forced-reset cycling mode, depending on training or range objectives.
• Drop-In Installation: No drilling, filing, or permanent alteration to your HK MR223 or MR556 lower receiver is required. The trigger assembly uses factory pin dimensions and includes all necessary springs and components for a direct swap.
• Single-Stage Pull Weight: Factory-set at approximately 4.5 to 5.0 pounds with a crisp, defined break. The single-stage design eliminates take-up, providing immediate engagement with each pull.

Additional Specifications

• Manufacturer: Rare Breed
• Category: Triggers
• Platform Compatibility: HK MR223, HK MR556
• Material: Billet 7075-T6 aluminum housing, stainless steel sear and hammer
• Finish: Type III hard-coat anodized, black
• Includes: Trigger assembly, selector lever, springs, pins, and installation instructions

Who It's For

This trigger is intended for experienced shooters, competition participants, and firearms enthusiasts who own an HK MR223 or MR556 and are looking to optimize their rifle's trigger response. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is not a beginner-level modification; it requires the user to understand how forced-reset systems interact with bolt carrier velocity and recoil management. It is best suited for those who train regularly and want to reduce split times while maintaining positive control over each shot. Law enforcement and professional end users who have evaluated forced-reset technology may also find this trigger useful for specific training drills.

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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