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

If you own an HK MR223 or MR556 and have been looking for a trigger that changes the way you think about your rifle’s fire control group, the FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger is worth a close look. Manufactured by Rare Breed, this trigger is designed specifically for the HK platform, not as a drop-in for AR-15s. It uses a forced-reset mechanism that requires the shooter to maintain forward pressure on the trigger while the bolt cycles, resetting the trigger shoe automatically. The result is a fast, controlled shooting experience that rewards proper technique. The flat shoe offers a consistent, repeatable finger placement, and the three-position selector gives you safe, semi-auto, and the forced-reset mode. This is not a gimmick; it is a precision-engineered component for shooters who understand the mechanics of their rifle.

Overview

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger is built specifically for the HK MR223 and HK MR556 platforms. Rare Breed designed this trigger to work with the unique bolt carrier group and hammer geometry found in these rifles. Unlike standard triggers where the trigger resets only after you release it fully, the forced-reset mechanism in the FRT-MR3 pushes the trigger shoe forward after each shot, allowing you to fire again with a short, deliberate pull. This trigger is a single-stage design with a crisp break and no take-up, giving you a direct connection to the sear. The flat trigger shoe reduces finger fatigue during extended shooting sessions and provides a more consistent pull angle. This is a hands-on upgrade for anyone who wants to maximize the performance of their HK rifle without modifying the receiver or bolt carrier.

Features & Specs

• Three-position selector: safe, semi-automatic, and forced-reset mode for controlled rapid fire.
• Flat single-stage trigger shoe with a consistent 4.5 to 5.5 pound pull weight across all positions.
• Manufactured by Rare Breed specifically for HK MR223 and MR556 platforms, not a modified AR-15 trigger.

Additional specs include a hardened steel hammer and sear that engage reliably with the HK bolt carrier. The trigger housing is precision-machined to fit the HK lower receiver without any modifications. Installation requires basic armorer skills and standard pin sizes. The forced-reset function works best with factory-spec ammunition and standard buffer systems. Rare Breed recommends using the trigger with your rifle’s original hammer spring for consistent performance. The flat shoe has a textured face for positive engagement, even with gloves on.

Who It’s For

This trigger is for the experienced HK owner who understands the mechanics of their rifle and wants to push its performance. It is not for casual plinkers or first-time builders. The FRT-MR3 is ideal for competitive shooters who need fast follow-up shots in divisions that allow forced-reset triggers, or for enthusiasts who want to explore the capabilities of their MR223 or MR556. If you have spent time behind your HK and know how the bolt carrier group behaves, you will appreciate the engineering behind this trigger. It requires deliberate trigger discipline and a consistent grip to function properly. This is a tool for shooters who treat their rifle as a system and want a fire control group that matches their skill level.

Shipping & FFL

This FRT-MR3 trigger is classified as a firearm part and does not require shipment to an FFL dealer for the trigger assembly itself. However, it is your responsibility to verify that the installation and use of this trigger complies with all applicable federal, state, and local laws. Some states and localities have restrictions on forced-reset triggers or three-position selectors. Rare Breed and this retailer do not provide legal advice. By purchasing this trigger, you acknowledge that you are solely responsible for ensuring compliance with all laws in your jurisdiction. We recommend checking with your local firearms authority before ordering. This product ships via insured carrier with signature required. No returns on installed or modified trigger assemblies.