Description

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

Overview

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 represents a precision-engineered upgrade for owners of these specific HK-platform rifles. Manufactured by Rare Breed, this trigger assembly is designed to interface directly with the HK MR223 and HK MR556 lower receivers without requiring permanent modifications to the firearm. The FRT-MR3™ operates on a forced reset principle, where the trigger mechanism resets forward under spring tension immediately following the bolt carrier group’s rearward travel, enabling a distinct three-position selector configuration. This product is classified as a trigger component and is intended for use in semi-automatic firearms that accept standard HK MR-series trigger groups. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is built to Rare Breed’s known tolerances and material specifications, utilizing heat-treated steel components and precision-machined engagement surfaces.

Features & Specs

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 incorporates several distinct design elements that distinguish it from standard drop-in trigger assemblies. Below is a summary of its core specifications and functional characteristics.

• Three-position selector functionality: Safe, Semi-Automatic, and Forced Reset modes; the forced reset position utilizes a mechanical sear interface that resets the trigger shoe forward independently of user finger motion
• Single-stage trigger pull weight calibrated to approximately 5.5 to 6.5 pounds as measured from the factory; pull weight is determined by the engagement geometry of the hammer and disconnector surfaces
• Constructed from 4140 steel with a phosphate or nitride finish for corrosion resistance; hammer and trigger components are heat-treated to 40-45 HRC for consistent wear characteristics

• Direct compatibility with HK MR223 and HK MR556 lower receivers; no gunsmith fitting required for installation into factory-spec trigger pockets; utilizes standard HK trigger pin diameters and spacing
• Hammer profile designed to interface with the HK bolt carrier group’s rearward travel path; the forced reset function relies on the carrier’s forward momentum to reset the hammer sear engagement
• Includes all necessary springs, pins, and detents; trigger housing is constructed from machined aluminum with steel reinforcement inserts at wear points

Who It’s For

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is intended for shooters who own an HK MR223 or HK MR556 and seek an alternative trigger system that offers a three-position selector arrangement. This product is designed for experienced firearms owners who understand the mechanical operation of forced reset trigger systems and who prioritize component compatibility with their specific HK-platform rifle. The FRT-MR3™ is not a drop-in trigger for AR-15 pattern rifles; it is explicitly engineered for the HK MR223 and MR556 lower receiver pocket dimensions and trigger pin spacing. Shooters who require a trigger assembly that does not modify the firearm’s original semi-automatic classification may evaluate this component based on their understanding of applicable regulations. This product is suitable for range use and competition settings where the three-position selector provides a distinct firing mode option.

Shipping & FFL

This FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is classified by Rare Breed as a firearm component and not a firearm receiver or complete weapon. As such, it ships directly to the purchaser’s residential or business address without requiring transfer through a Federal Firearms License (FFL) dealer. Standard shipping carriers and transit times apply. The purchaser is solely responsible for verifying that this trigger component is legal to possess and install in their jurisdiction. Local, state, and municipal laws may impose restrictions on forced reset triggers or three-position selector mechanisms. Rare Breed and the retailer disclaim any liability for non-compliance with applicable laws. By purchasing this product, the buyer affirms that they are legally permitted to own this component and that they will install it in compliance with all federal, state, and local statutes. No returns or exchanges will be accepted for this item once the packaging is opened due to safety and regulatory considerations.