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 is a precision-engineered fire control component designed specifically for the HK MR223 and MR556 platform. Manufactured by Rare Breed, this trigger replaces the factory unit with a drop-in design that offers a distinct mechanical cycling profile. Each trigger is built to MIL-SPEC tolerances and tested for consistent reset timing across all three selector positions.

Overview

This FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 operates on a forced-reset principle where the trigger forward movement is mechanically driven by the bolt carrier group. The flat face trigger shoe provides a consistent finger placement reference and a reduced over-travel window. The three-position selector includes safe, semi-automatic, and the forced-reset function. This trigger is a direct replacement for the standard HK trigger pack and requires no permanent modification to the lower receiver.

Features & Specs

The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is machined from billet 4140 steel with a QPQ corrosion-resistant finish. The trigger housing is precision-milled to eliminate slop and ensure a tight lock-up with the HK trigger pocket. The flat shoe design reduces finger fatigue during extended use and offers a clean single-stage break with no take-up or creep.

• Manufacturer: Rare Breed; Category: Triggers; Platform-specific for HK MR223 and MR556
• Three-position selector: safe, semi-automatic, forced-reset function; flat trigger shoe geometry
• Drop-in installation with included pins and springs; no gunsmithing required; compatible with factory safety selector

• Billet 4140 steel construction with QPQ finish; tested to 20,000+ cycles
• Single-stage design with a crisp break; consistent reset timing per ATF evaluation letter 2023-001
• Weight: 3.2 oz; overall length: 2.85 inches; includes anti-walk trigger pin set

• Compatible with standard HK MR223 and MR556 lower receivers; not for use with AR-15 platforms
• Includes detailed installation guide and function check procedure
• Backed by Rare Breed manufacturer warranty against defects in materials and workmanship

Who It’s For

This trigger is designed for HK MR223 and MR556 owners who want a mechanically distinct cycling system without altering their rifle’s receiver. It is suitable for competitive shooters in divisions that permit forced-reset triggers, as well as collectors who value original-spec components. The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is also appropriate for law enforcement armories that require a non-standard fire control option for evaluation or training. It is not intended for general-purpose hunting or for use in restricted jurisdictions.

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 an FFL dealer for shipment to most states. However, customers are responsible for verifying that this trigger is legal to own and install in their jurisdiction. Some states and localities restrict the possession or installation of forced-reset triggers. We ship via UPS Ground with signature confirmation. No international shipping. By purchasing, you confirm compliance with all applicable federal, state, and local laws regarding trigger components.