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 is a precision-engineered drop-in trigger system designed specifically for HK-pattern rifles. Built by Rare Breed, a manufacturer known for pushing trigger technology forward, the FRT-MR3™ offers three distinct selector positions: Safe, Semi-Automatic, and Forced Reset. This trigger leverages the forced reset operating principle to deliver a consistent, repeatable shooting experience without modifying your firearm’s lower receiver. Each unit is machined from heat-treated steel and finished with a corrosion-resistant coating for long-term reliability in demanding conditions.

Features & Specs

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is engineered to strict tolerances for direct compatibility with both the HK MR223 and HK MR556 platforms. Below are the critical specifications and design details.

• Manufacturer: Rare Breed | Category: Triggers | Platform: HK MR223 / MR556
• Three-position selector: Safe, Semi-Automatic, Forced Reset (FR) mode
• Single-stage trigger pull with a consistent break weight; includes all necessary drop-in components and anti-walk pins

Additional performance features include a positive reset feel in forced reset mode and a semi-automatic mode that functions as a standard single-stage trigger. The FRT-MR3™ requires no permanent modifications to the receiver and is installed using standard tools.

• Heat-treated steel hammer, trigger, and disconnector for extended service life
• Drop-in design — no filing, fitting, or gunsmithing required for standard HK lower receivers
• Includes detailed installation guide and manufacturer warranty information

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 demand precise trigger control and a faster follow-up shot capability without sacrificing safety. It is suited for competitive shooters, experienced firearm owners, and those who train with high-volume drills. This trigger is not recommended for shooters unfamiliar with forced reset operation, as the distinct trigger travel and reset behavior require intentional practice. The three-position selector allows the user to switch between standard semi-automatic fire and forced reset mode, making it a versatile option for both range training and defensive use.

• Designed exclusively for HK MR223 and HK MR556 rifles with standard trigger pockets
• Not compatible with other HK-pattern or AR-15 platforms without verification of receiver dimensions
• Includes all necessary springs, pins, and selector components for a complete installation

Shipping & FFL

This FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a firearm component and does not require transfer through a Federal Firearms License (FFL) for shipment to most states. However, some states and localities have enacted restrictions on forced reset triggers. It is the buyer’s sole responsibility to verify that this product is legal to own and possess in their jurisdiction before placing an order. Rare Breed triggers are regulated by federal and state laws, and we reserve the right to cancel any order that violates applicable statutes. Standard shipping rates apply, and orders typically process within 1-3 business days. Signature may be required upon delivery. No returns on installed or modified trigger components.