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

When your platform demands uncompromised performance, the FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 and HK MR556 delivers a precision-engineered upgrade that transforms your firearm’s capability. Designed by Rare Breed specifically for the MR223 and MR556 receiver geometry, this trigger system provides a distinct mechanical advantage without sacrificing reliability. The flat-faced shoe offers consistent finger placement for repeatable shots, while the forced-reset mechanism enables rapid follow-up shots through a unique cycling action. Whether you are building a competition rifle or a high-performance duty carbine, this trigger sets a new standard for the platform.

Overview

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 and MR556 is a direct drop-in replacement that requires no permanent modification to your lower receiver. It operates in three distinct positions: safe, semi-automatic, and forced-reset mode. In forced-reset mode, the trigger resets forward automatically after each shot as the bolt carrier cycles, allowing the shooter to maintain trigger contact and fire again with minimal travel. This system is built to the same exacting standards as the original FRT-15 but tailored for the unique hammer geometry and bolt carrier dimensions of the HK MR223 and MR556 platforms.

Features and Specs

• Three-position selector: safe, semi-automatic, and forced-reset mode with audible and tactile detent feedback at each position.
• Flat trigger shoe with textured face for consistent finger placement and reduced side-to-side play for improved accuracy.
• Single-stage pull with a clean break and short reset in semi-automatic mode; forced-reset mode cycles with bolt carrier return for rapid follow-up shots.

• Manufactured by Rare Breed with CNC-machined steel components and heat-treated internal parts for extended service life.
• Drop-in design fits HK MR223 and HK MR556 lower receivers without filing, drilling, or permanent modifications.
• Includes trigger assembly, selector lever, trigger pin set, and installation instructions. Weight and pull specifications are available from the manufacturer.

• Compatible with standard HK MR223 and MR556 bolt carrier groups; no aftermarket buffer or spring required for function.
• Flat trigger profile reduces over-travel and provides a consistent release point across both semi-automatic and forced-reset modes.
• All components are manufactured in the United States and comply with current ATF guidelines as of the date of manufacture.

Who It Is For

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 and MR556 is designed for the discerning HK platform owner who demands precision and speed. It is ideal for competitive shooters in tactical rifle divisions who want a trigger that rewards technique with faster splits. It also serves law enforcement and security professionals who operate the MR223 or MR556 and require a trigger that supports rapid target transitions without sacrificing safety. Enthusiasts who appreciate the mechanical sophistication of forced-reset technology will find this trigger a natural fit for their build. This product assumes the user has a working understanding of firearm safety protocols and trigger maintenance procedures.

Shipping and FFL

This trigger is classified as a firearm component and does not require shipment to a Federal Firearms License (FFL) dealer for transfer. Rare Breed triggers are shipped directly to the customer’s billing address in compliance with all applicable federal regulations. However, it is the buyer’s sole responsibility to verify that this product is legal to own and install in their state, county, and municipality. Some jurisdictions restrict or prohibit forced-reset triggers, and compliance with local laws is mandatory. By placing an order, you certify that you are legally permitted to purchase and possess this item. All sales are final, and shipments are processed within one to three business days via insured carriers. For complete terms, refer to our shipping policy page before checkout.