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 drop-in fire control system engineered by Rare Breed specifically for the HK MR223 and MR556 platforms. This trigger utilizes a forced-reset mechanism that returns the trigger forward immediately after each shot, enabling rapid follow-up shots while maintaining semi-automatic function. The three-position selector provides safe, semi-automatic, and forced-reset modes, giving the shooter direct control over the firing cycle. Built to MIL-SPEC dimensions, the FRT-MR3™ installs without permanent modification to the host firearm.

Designed for the end user who demands a trigger that keeps pace with the MR platform’s reliability, the FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 delivers consistent reset timing without pre-travel creep. Each unit is assembled and tested at Rare Breed’s US facility.

Features & Specs

• Three-position selector: Safe, Semi-Automatic, and Forced-Reset mode. The forced-reset position uses the bolt carrier’s forward motion to mechanically reset the trigger shoe, allowing the shooter to control the rate of fire through trigger manipulation.
• Single-stage pull weight of approximately 4.5 to 5.5 pounds. The trigger breaks clean with no take-up in forced-reset mode. The semi-automatic position functions as a standard single-stage trigger.
• Drop-in design for HK MR223 and HK MR556 lower receivers. No gunsmithing required. Includes all necessary pins and springs. Compatible with factory and mil-spec safety selectors.

• Manufacturer: Rare Breed. Category: Triggers. The FRT-MR3™ is machined from billet steel and heat-treated for wear resistance. The trigger shoe is contoured for gloved use.
• All internal components are nickel-Teflon coated for reduced friction and corrosion resistance. The hammer is profiled to ensure consistent primer strikes across various ammunition types.
• Each unit undergoes function testing with full-auto rated bolts and carriers. The forced-reset mechanism is self-contained within the trigger pack and does not rely on buffer weight or spring tension adjustments.

Who It’s For

The FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 is intended for shooters who train with high-round-count drills and want a trigger that matches the MR556’s gas piston reliability. It suits competitive shooters in divisions that permit forced-reset triggers, as well as enthusiasts who want to maximize their MR223’s cyclic capabilities without converting to full-auto. Law enforcement armorers evaluating advanced trigger systems for patrol rifles will find the FRT-MR3™’s consistent reset useful for qualification courses requiring rapid target transitions.

This trigger is not recommended for benchrest precision shooting due to the forced-reset mechanism’s inherent design. It is optimized for speed-focused applications where split times matter more than sub-MOA group sizes.

Shipping & FFL

This trigger ships directly to your residential or business address. No firearm transfer is required because the FRT-MR3™ is a fire control component, not a firearm receiver. However, you must be at least 18 years old to purchase and must comply with all state and local laws regarding trigger components. Some states and municipalities have enacted restrictions on forced-reset triggers. It is your responsibility to verify that the FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 is legal in your jurisdiction before ordering.

If your state requires shipment to a Federal Firearms Licensee (FFL), select that option at checkout. Standard processing time is 2-3 business days. We ship via UPS Ground with signature confirmation. International shipping is not available. Rare Breed triggers are warranted against manufacturer defects for one year from the date of purchase. No returns on installed or modified triggers.