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 is a precision-engineered fire control component developed by Rare Breed specifically for the HK MR223 and HK MR556 platforms. This trigger system utilizes a forced-reset mechanism that returns the trigger forward under spring tension immediately following hammer release, enabling a rapid cycling capability while maintaining single-shot functionality per trigger pull. The FRT-MR3™ features three selectable positions: Safe, Semi-Automatic, and Forced-Reset mode. Constructed from heat-treated steel components and machined aluminum housings, this trigger is designed to meet the dimensional and operational tolerances required by HK-pattern lower receivers. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 replaces factory trigger groups without requiring permanent modifications to the host firearm.

Features & Specs

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is built to the specifications outlined by Rare Breed for the MR-platform market. Below are the core technical attributes and included components.

• Manufacturer: Rare Breed; Category: Triggers; Single-stage design with a consistent 4.5 to 5.5-pound trigger pull weight across all three positions
• Three-position selector: Safe (lever locked), Semi-Automatic (standard single-shot operation), and Forced-Reset mode (trigger must fully cycle forward before next discharge)
• Includes drop-in trigger cassette, hammer, disconnector, selector lever, and all necessary pins and springs; no gunsmith fitting required for HK MR223 and MR556 lower receivers

The forced-reset function operates by utilizing the bolt carrier group’s forward travel to mechanically reset the trigger shoe, distinct from binary or full-automatic systems. All internal components are CNC-machined from 4140 steel and hard-coat anodized aluminum.

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 require a trigger system that delivers consistent single-stage performance while providing an alternative firing mode for range use and training applications. This product is suited for HK MR223 and HK MR556 owners seeking to replace factory Mil-Spec triggers with a component that offers selectable functionality and repeatable reset characteristics. The FRT-MR3™ is designed for users familiar with AR-platform manual of arms who understand the operational parameters of forced-reset systems. This trigger is not recommended for defensive or duty use unless the user has received formal instruction on forced-reset trigger operation. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is optimized for semi-automatic firearms chambered in 5.56 NATO and .223 Remington.

Shipping & FFL

This FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 ships directly to your residence or business address. No Federal Firearms License (FFL) transfer is required for this product as it is classified as a firearm component and not a complete firearm frame or receiver. All orders are processed within one to three business days. Signature may be required upon delivery. Buyers are responsible for verifying that forced-reset trigger systems are legal to possess and install in their jurisdiction. Check local, state, and federal laws before placing an order. Rare Breed triggers are not available for shipment to states or municipalities that restrict the sale or possession of forced-reset trigger mechanisms. We reserve the right to cancel any order that violates applicable laws. This product is sold as a component part and must be installed in compliance with all applicable regulations. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a mechanical component and does not convert a firearm to automatic fire. By purchasing this trigger, you acknowledge that you are solely responsible for compliance with all laws governing its use and installation.