Description

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

Precision performance in a compact platform demands a trigger system that matches the engineering of the host firearm. The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 represents a purpose-built upgrade for shooters who require reliable, repeatable trigger reset mechanics. Designed and manufactured by Rare Breed, this trigger system installs directly into the MR223 and MR556 lower receivers without permanent modification, delivering a distinct three-position selector function that enhances shooting cadence under controlled conditions.

Overview

The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 utilizes a forced-reset mechanism that returns the trigger forward after each shot, allowing the shooter to maintain a consistent finger position throughout the firing cycle. The flat trigger shoe provides a wide, comfortable contact surface that reduces finger fatigue during extended range sessions. Each unit is assembled in the United States using heat-treated steel components and precision-machined internal parts to ensure dimensional accuracy within the HK trigger pocket.

Features & Specs

• Three-position selector: Safe, Semi-Automatic, and Forced-Reset mode, providing the shooter with clear tactile and auditory position indicators.
• Flat trigger shoe with serrated face reduces slip and offers a consistent pull weight across all three positions.
• Single-stage design with a crisp break and short reset travel, engineered specifically for the HK MR223 and MR556 platform geometry.

Manufactured by Rare Breed and categorized as a drop-in trigger system, the FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 includes all necessary springs, pins, and instructions for installation. The housing is constructed from billet aluminum with a Type III hard coat anodized finish for corrosion resistance and long-term durability.

Who It’s For

This trigger is designed for experienced shooters who own HK-pattern rifles chambered in 5.56 NATO and understand the operational characteristics of forced-reset trigger systems. It is suitable for competitive shooters participating in practical rifle matches, firearms instructors demonstrating trigger control techniques, and enthusiasts who maintain their own firearms and prefer aftermarket upgrades that do not require gunsmith fitting. The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is not recommended for first-time AR-platform users or those unfamiliar with forced-reset mechanics.

Shipping & FFL

This product ships directly to your local Federal Firearms License (FFL) dealer. All federal, state, and local laws regarding trigger systems and firearm components apply. It is the purchaser’s responsibility to verify that this trigger is legal to own and install in their jurisdiction before placing an order. Rare Breed triggers are classified as firearm components and are subject to the same transfer requirements as other regulated parts in certain states. Please confirm with your receiving FFL that they will accept transfers of this item. We do not ship to P.O. boxes, and signature is required upon delivery.

• Included: Trigger assembly, selector, trigger pins, hammer spring, and installation guide.
• Compatibility: HK MR223 and HK MR556 only. Does not fit AR-15 or other HK-pattern rifles without verification.
• Warranty: Manufacturer warranty covers defects in materials and workmanship for one year from purchase date.