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

Designed and manufactured by Rare Breed, the FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a precision-engineered drop-in upgrade specifically for HK-platform semi-automatic rifles. This trigger delivers a defined three-position selector function while utilizing forced reset mechanics to return the trigger shoe forward rapidly after each shot. Built for shooters who demand consistent reset and reliable cycling under live-fire conditions, the FRT-MR3™ is a direct commercial upgrade for the MR223 and MR556 host platforms.

Overview

The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 represents Rare Breed’s latest development in forced reset trigger technology. This unit replaces the factory trigger assembly without requiring permanent modification to the lower receiver. The three-position safety selector provides safe, semi-automatic, and forced-reset positions. The flat-faced trigger shoe offers a consistent finger placement surface, reducing pull variation during rapid engagements. End users in Illinois should verify local compliance with all applicable state and municipal regulations before purchase or installation.

Features & Specs

• Three-position selector: safe, semi-automatic, and forced-reset operating mode for the HK MR223 and HK MR556
• Flat trigger shoe profile designed for consistent trigger finger placement and reduced overtravel
• Single-stage pull with a mechanical forced-reset function that returns the trigger forward immediately after each shot cycle

• Drop-in design requires no permanent modification to the HK lower receiver
• Manufactured by Rare Breed, a US-based producer of firearm trigger systems
• Category: Triggers — compatible with HK MR223 and HK MR556 platforms only

• Heat-treated steel internal components for sustained performance under repeated firing schedules
• Pre-set spring tension for consistent pull weight across all three selector positions
• Direct replacement for factory trigger group; includes all necessary pins and springs

Who It’s For

This trigger system is intended for experienced shooters and HK-platform owners who want a mechanical forced-reset trigger with a flat shoe profile. It is suited for range use, competitive shooting applications, and shooters who train with high-volume fire drills. The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is not designed for general hunting, law enforcement duty, or defensive carry. Installers should possess basic familiarity with AR-15 or HK-pattern trigger replacement procedures. Rare Breed recommends installation by a qualified gunsmith if the user is not comfortable with disassembly of the lower receiver group.

Shipping & FFL

This item ships directly to your chosen Federal Firearms License (FFL) dealer. All federal, state, and local laws apply. The purchaser is solely responsible for verifying that the FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is legal to own and install within their jurisdiction, including all municipalities in the state of Illinois. Rare Breed triggers are regulated under federal law as firearm components. No returns or exchanges are accepted on installed or modified trigger units. Please confirm with your receiving FFL that they will accept delivery of this item before placing your order. Standard shipping rates apply, and delivery timelines vary by FFL processing speed.