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

This FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a direct-fit, drop-in replacement trigger assembly engineered by Rare Breed for the HK MR223 and MR556 platform. Designed for shooters who demand precise hammer follow-through and a consistent reset point, this unit replaces the factory trigger pack without requiring permanent modification to the lower receiver. The flat trigger shoe provides a consistent finger placement surface, reducing pull weight variation across multiple shots.

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 immediately after each shot cycle, enabling a rapid, controlled firing sequence. The three-position selector offers safe, semi-automatic, and forced-reset modes, giving the operator full control over the firing rate. Each trigger unit is machined from 4140 steel and finished with a QPQ corrosion-resistant coating. The flat shoe geometry reduces over-travel and provides a neutral finger angle for consistent trigger manipulation under rapid fire.

Features & Specs

• Drop-in design for HK MR223 and MR556 lower receivers; no sear modification or permanent alteration required for installation
• Three-position selector: Safe (lever blocked), Semi-Automatic (standard single-shot fire), and Forced-Reset (trigger resets forward automatically after bolt carrier return)
• Flat trigger shoe with 0.220-inch width, 90-degree break angle, and approximately 4.5-pound pull weight (measured at trigger shoe center)
• Single-stage sear engagement with a crisp, defined wall and minimal creep before release
• All internal components constructed from 4140 steel with QPQ nitriding for wear resistance and corrosion protection
• Hammer spring tension optimized for mil-spec primers; verified function with 55-grain to 77-grain 5.56 NATO ammunition
• Includes full trigger pack, selector lever, hammer, disconnector, and all necessary springs and pins

Who It Is For

This trigger is intended for competitive shooters, high-volume range users, and firearms owners who operate HK MR223 or MR556 rifles and require a reproducible, fast-resetting trigger system. The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is suited for shooters who practice controlled pairs, rapid target transitions, and timed drills where trigger recovery speed affects split times. It is not a binary trigger and does not alter the firearm’s classification under federal law when used in the forced-reset position. Users should verify compatibility with their specific HK MR223 or MR556 variant, including barrel length and gas system configuration, before purchase.

Shipping & FFL

This FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a firearm component and does not require shipment to a Federal Firearms License (FFL) dealer. It may be shipped directly to your residential or business address in states where the item is legally permitted. Buyers are solely responsible for ensuring compliance with all applicable local, state, and federal laws regarding trigger installation and use. Rare Breed triggers are not approved for use in all jurisdictions; check your state and municipal regulations before ordering. We do not ship to restricted locations. By purchasing this product, you confirm that you are legally allowed to own and install this component in your firearm.