Description

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 represents a precision-engineered fire control component developed by Rare Breed. This trigger unit is specifically designed to interface with the HK MR223 and HK MR556 platform, offering a forced-reset mechanism that operates within a three-position selector configuration. As a single-stage trigger, it provides a consistent, crisp break without take-up, while the flat trigger shoe geometry reduces finger reach and improves control surface contact. The FRT-MR3 is manufactured to tight tolerances using heat-treated steel components and is intended for users who require reliable, repeatable trigger performance in a semi-automatic platform.

Overview

Rare Breed has engineered the FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 to meet the demands of precision-minded shooters who operate HK-pattern rifles. This trigger system utilizes a forced-reset function that mechanically returns the trigger forward after each shot, enabling the shooter to maintain a stable firing rhythm without modifying the host firearm’s bolt carrier group or buffer system. The three-position selector allows for safe, semi-automatic, and forced-reset modes, providing operational flexibility while adhering to ATF guidelines as a non-machinegun component. The flat trigger profile is machined from 4140 steel with a nitride finish, offering reduced friction and enhanced durability under sustained use.

Features & Specs

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 incorporates several technical specifications that distinguish it from standard drop-in triggers. Each unit is assembled with precision-ground sear surfaces and a proprietary spring set calibrated for consistent reset force. The following features define this product:

• Three-position selector: safe, semi-automatic, and forced-reset mode with positive detent engagement at each stop; hammer-forged steel selector lever with anti-walk interface
• Single-stage trigger pull weight: factory set at 4.5 to 5.5 pounds with minimal overtravel; flat trigger shoe with serrated face for slip-resistant control
• Direct-fit installation into HK MR223 and HK MR556 lower receivers; includes all necessary pins, springs, and instructions; no permanent modification to the host firearm required

Additional manufacturer specifications include a hammer forged from S7 tool steel with a black nitride coating, a disconnector machined from billet 8620 steel, and a housing constructed from 7075-T6 aluminum with hardcoat anodizing. The trigger system is compatible with standard HK MR223 and MR556 bolt carrier groups and does not require aftermarket buffers or springs.

Who It’s 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 HK MR223 or MR556 rifles and seek a trigger system that provides enhanced shot-to-shot consistency. This product is suited for competitive shooters in divisions that allow forced-reset triggers, as well as for law enforcement personnel and civilian marksmen who train with high-round-count drills. The flat trigger shoe benefits shooters with shorter fingers or those who prefer a straighter rearward pull to reduce muzzle movement during rapid fire. Users should have a working knowledge of AR-platform trigger installation and function-check procedures, as the forced-reset mechanism requires correct assembly to operate as designed. This trigger is not recommended for first-time firearm owners or those unfamiliar with semi-automatic trigger systems.

Shipping & FFL

This FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is classified as a firearm part and does not require transfer through a Federal Firearms License (FFL) dealer for shipment to most states. However, customers must verify that their state and local laws permit ownership and installation of forced-reset trigger systems. Rare Breed and this retailer assume no liability for compliance with state regulations, and the purchaser bears sole responsibility for ensuring legal possession. This product ships via insured ground delivery and typically arrives within five to ten business days after order processing. International shipping is not available. By purchasing this trigger, the buyer confirms that they are legally eligible to own firearm components and that they will not use this product in a manner that violates federal, state, or local law.