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 developed by Rare Breed. Designed exclusively for HK-pattern semi-automatic rifles, this trigger leverages forced-reset technology to deliver a distinct three-position selector functionality. The FRT-MR3™ allows the operator to choose between safe, semi-automatic fire, and a forced-reset cycling mode that resets the trigger shoe forward after each shot, enabling rapid follow-up shots while maintaining compliance with applicable firearm regulations. This unit is built to the exacting tolerances required by the MR223 and MR556 platforms, ensuring reliable function under adverse conditions.

Features & Specs

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is constructed from heat-treated steel components with a nickel-Teflon coated trigger and hammer for reduced friction and consistent pull weight. The single-stage design provides a clean, crisp break with no take-up, while the integrated forced-reset mechanism re-engages the sear automatically upon bolt carrier return. Specifications include a trigger pull weight of approximately 4.5 to 5.5 pounds, a .154-inch trigger pin diameter for compatibility with HK lower receivers, and a drop-in housing that requires no permanent modification to the firearm.

• Three-position selector: Safe, Semi, and Forced Reset (FR) mode with distinct tactile detents
• Single-stage trigger geometry with a short, positive reset and minimal overtravel
• Drop-in design using factory trigger pin holes; includes anti-walk pins for secure installation

• Nickel-Teflon coated hammer and trigger for corrosion resistance and reduced friction
• Heat-treated 4140 steel sear and disconnector for extended service life under high-round-count use
• Compatible with standard and ambidextrous safety selectors on MR223 and MR556 lower receivers

• Tested for function with 5.56x45mm NATO and .223 Remington ammunition across various barrel lengths
• Manufactured in the United States by Rare Breed, a manufacturer of forced-reset trigger systems
• Includes detailed installation instructions and necessary spring sets for HK-platform fitment

Who It’s For

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is intended for experienced shooters, competitive marksmen, and firearms enthusiasts who operate HK-pattern rifles and seek enhanced trigger performance without altering the firearm’s external configuration. This trigger is suitable for range training, tactical drills, and high-volume shooting applications where rapid target transitions and consistent trigger manipulation are required. It is not recommended for novice shooters or for use in hunting applications due to the specialized forced-reset operating characteristics. Users should possess a thorough understanding of trigger mechanics and safe firearm handling before installing this component.

Shipping & FFL

This product is classified as a firearm component and may be shipped directly to your residential or business address without requiring transfer through a Federal Firearms License (FFL) dealer, provided local and state laws permit such shipment. However, it is the sole responsibility of the purchaser to verify that the FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is legal to possess and install in their jurisdiction. Some states and municipalities impose restrictions on forced-reset triggers or binary-style trigger systems. Rare Breed and this retailer assume no liability for non-compliance with local regulations. By purchasing this item, you certify that you are not prohibited from owning firearm parts and that you will comply with all applicable laws. Standard shipping rates and lead times apply; expedited options are available at checkout.