FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a dedicated performance upgrade engineered by Rare Breed for the HK MR223 and MR556 platform. This trigger system delivers a distinct mechanical cycling method that resets the trigger forward under recoil, enabling rapid follow-up shots without modifying the firearm’s internal operating system. Designed for shooters who demand precision and speed, this unit replaces the factory trigger pack with a drop-in assembly that requires no permanent alterations to the host rifle.

Overview

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 represents a category-specific advancement in trigger technology for these HK pattern rifles. Rare Breed engineered this unit to function exclusively with the MR223 and MR556 receivers, ensuring correct sear engagement and hammer travel. The three-position selector permits safe, semi-automatic, and forced-reset modes, giving the operator clear control over firing rates. Unlike binary triggers, the forced-reset mechanism returns the trigger shoe to the forward position automatically after each shot, requiring the user to release and depress the trigger again for subsequent rounds. This design is legal under current federal regulations as it does not convert the rifle to full automatic fire.

Features & Specs

• Single-stage trigger pull with a flat shoe profile, reducing finger drag and providing a consistent break point at approximately 4.5 pounds.
• Three-position selector: safe, semi-automatic, and forced-reset mode. The forced-reset position enables the trigger to reset forward under bolt carrier energy, allowing for accelerated shot cycling.
• Drop-in design for HK MR223 and MR556 lower receivers. No gunsmithing, drilling, or permanent modifications required for installation.

Additional specifications include a hardened steel hammer and sear components treated with a corrosion-resistant finish. The trigger housing is machined from billet aluminum to maintain tight tolerances within the HK trigger pocket. Rare Breed includes all necessary springs, pins, and selector components for a complete retrofit. This trigger is not compatible with AR-15 or AR-10 lowers; it is purpose-built for the HK MR223 and MR556 platform.

Who It Is For

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is intended for experienced shooters who own an HK MR223 or MR556 and wish to increase their practical rate of fire while retaining semi-automatic compliance. This product suits competition shooters in divisions that permit forced-reset triggers, as well as firearms enthusiasts who train for controlled rapid engagement. It is not designed for novice users or those unfamiliar with trigger discipline, as the forced-reset function requires deliberate trigger management to avoid unintentional discharges. Law enforcement and civilian shooters who understand the mechanical operation of forced-reset systems will find this trigger a reliable upgrade for their HK platform.

Shipping & FFL

This trigger ships directly to your residence or business address within the United States. No Federal Firearms License (FFL) transfer is required for this product because it is classified as a firearm component, not a serialized receiver. However, state and local laws vary regarding forced-reset triggers. It is your responsibility to verify that the FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is legal to own and install in your jurisdiction. Rare Breed and this retailer assume no liability for non-compliance with local, state, or federal regulations. Please check with your local law enforcement or legal counsel before purchasing.