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 precision-engineered drop-in trigger system from Rare Breed. Designed specifically for the HK MR223 and MR556 platforms, this trigger leverages a forced reset mechanism to deliver a distinct three-position selectability: Safe, Semi-Automatic, and a forced-reset mode. Built around a flat-faced trigger shoe, the FRT-MR3 provides a consistent, repeatable pull with a tactile reset that enhances shooter control without compromising reliability. Each unit is manufactured to tight tolerances, ensuring compatibility with factory-spec bolt carriers and hammer configurations.

Overview

Rare Breed developed the FRT-MR3 to meet the demands of shooters who require a trigger that combines innovative mechanical function with platform-specific fitment. Unlike conventional triggers, the forced reset design actively returns the trigger forward after each shot, reducing lock time and enabling a faster follow-up cadence. The flat trigger profile offers a broader contact surface, which aids in maintaining a consistent finger placement during rapid engagement. This trigger is a direct replacement for the factory unit in the HK MR223 and MR556, requiring no permanent modifications to the lower receiver. The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a purpose-built component for shooters seeking enhanced trigger dynamics within a legal semi-automatic framework.

Features & Specs

• Three-position selector: Safe, Semi-Automatic, and Forced Reset mode. The forced reset position mechanically returns the trigger forward after each shot, allowing for a rapid, controlled cycle without converting the firearm to full-auto capability.
• Flat-faced, single-stage trigger shoe. The flat profile reduces finger slip and provides a consistent pull weight across the entire firing sequence. The single-stage design eliminates take-up for a crisp break.
• Drop-in installation for HK MR223 and MR556 platforms. The assembly includes a precision-machined housing, sear, and hammer group that fits existing trigger pocket dimensions without gunsmithing. Includes all necessary pins and springs.

• Manufacturer: Rare Breed. Category: Triggers. The FRT-MR3 is produced under Rare Breed’s quality control standards, with each trigger inspected for function and dimensional accuracy before packaging.
• Constructed from heat-treated steel and billet aluminum components. The trigger shoe is a skeletonized flat design, reducing overall weight while maintaining structural integrity under repeated use.
• Pull weight is factory-set to approximately 4.5-5.5 pounds in semi-automatic mode, with consistent reset force in forced reset mode. The hammer profile is optimized for the MR223/MR556 bolt carrier group to ensure reliable primer impact.

Who It Is For

This trigger is intended for experienced shooters and firearm owners who possess a thorough understanding of semi-automatic operation and forced reset mechanics. It is suitable for competition shooters who require a high degree of trigger control during timed stages, as well as for enthusiasts who want to explore the mechanical characteristics of a forced reset system on their HK-pattern rifle. The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is not recommended for shooters unfamiliar with forced reset triggers or those who do not regularly maintain their firearms, as proper function depends on clean bolt carrier movement and adequate lubrication. This component is designed for use in a lawful manner and must be installed in a legal semi-automatic rifle configuration.

Shipping & FFL

This trigger is classified as a firearm component and may be shipped directly to your residential or business address. No Federal Firearms License (FFL) transfer is required for purchase or shipment of this product, as it does not constitute a firearm frame or receiver under current ATF regulations. However, it is your responsibility to verify that possession and installation of this forced reset trigger comply with all applicable federal, state, and local laws. Rare Breed and this retailer assume no liability for misuse or non-compliance. By purchasing this product, you confirm that you are legally eligible to own firearm components and that you will install and use the FRT-MR3 in accordance with all relevant statutes. Contact your local law enforcement or legal counsel if you have questions regarding legality in your jurisdiction.