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 represents a precision-engineered drop-in upgrade for the HK MR223 and HK MR556 platform. Manufactured by Rare Breed, this trigger assembly is designed for users seeking a single-stage trigger mechanism with three distinct selector positions: safe, semi-automatic, and forced reset. The forced reset function utilizes the firearm’s bolt carrier travel to mechanically reset the trigger shoe, allowing the shooter to maintain consistent trigger manipulation without relying solely on manual finger reset. This trigger is built to mil-spec dimensions and interfaces directly with the HK lower receiver without permanent modifications. Each unit undergoes individual function testing at the factory to verify sear engagement, reset timing, and positional lock-up across all three modes.

Features & Specs

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 incorporates Rare Breed’s proprietary cam system and hardened steel components. The trigger mechanism is housed in a CNC-machined 7075-T6 aluminum cassette with black nitride finish for corrosion resistance and lubricity. The single-stage pull weight is factory-set at approximately 4.5 to 5.5 pounds with minimal overtravel and a crisp break. The three-position selector rotates 90 degrees between safe, semi-automatic, and forced reset modes, with tactile and audible detent feedback at each stop. The forced reset position engages a spring-loaded lever that interfaces with the bolt carrier’s forward travel to mechanically push the trigger shoe forward after each shot, requiring the shooter to maintain rearward pressure on the trigger to cycle subsequent rounds.

• Three-position selector: safe, semi-automatic, forced reset
• Single-stage pull weight: 4.5-5.5 pounds (factory specification)
• CNC-machined 7075-T6 aluminum cassette with black nitride finish
• Drop-in design; no gunsmithing or permanent receiver modification required
• Includes anti-walk pins and extended selector lever for ambidextrous operation
• Hardened tool steel sear, hammer, and reset cam components

Who It’s For

This trigger is intended for experienced shooters who operate the HK MR223 or HK MR556 platform and require a single-stage trigger with a forced reset function. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is suitable for competitive shooting disciplines that permit three-position triggers, training scenarios where trigger reset manipulation is emphasized, and collectors who prioritize mechanical innovation in their firearm builds. Users should have a thorough understanding of their local and state laws regarding trigger mechanisms, as forced reset triggers may be subject to specific regulations in certain jurisdictions. This product is not recommended for novice shooters or those unfamiliar with forced reset trigger operation.

• Competitive shooters in three-gun or tactical rifle divisions
• Advanced HK MR223 and MR556 platform owners
• Instructors and trainers requiring consistent trigger reset mechanics
• Firearm enthusiasts seeking a single-stage alternative to standard mil-spec triggers

Shipping & FFL

This FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is classified as a firearm component and ships directly to the customer’s billing address. No Federal Firearms License (FFL) transfer is required for this trigger assembly as it is not a firearm frame, receiver, or complete weapon system. However, the end user is solely responsible for ensuring compliance with all applicable federal, state, and local laws governing the possession and installation of this trigger in their firearm. Some states and municipalities may classify forced reset triggers differently; it is the purchaser’s responsibility to verify legal status in their jurisdiction before ordering. Rare Breed and this retailer assume no liability for improper installation, misuse, or legal consequences arising from purchase or use of this product.

• Ships directly to your billing address; no FFL required
• Customer must verify local and state legality prior to purchase
• Installation should be performed by a qualified armorer or gunsmith
• All sales final; no returns on installed trigger components