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

Overview

Rare Breed has stepped up with the FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556, delivering a drop-in solution that respects the MR-series platform’s unique geometry. If you have handled a standard forced reset trigger in an AR-15, you already understand the concept—but this unit is purpose-built for HK’s proprietary lower receiver and bolt carrier group. The FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 uses a three-position selector: safe, semi-automatic, and forced-reset. In the third position, the trigger resets forward under spring tension as the bolt cycles, allowing you to ride the reset for rapid follow-up shots. No cutting, filing, or aftermarket bolt swaps required. This is a direct-fit component that takes advantage of the MR223 and MR556’s robust gas system without compromising reliability.

Features & Specs

The FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 is machined from hardened steel and finished with a corrosion-resistant coating. It uses a single-stage break with a crisp, predictable wall before the sear releases. The trigger shoe is contoured for gloved or bare fingers, and the hammer profile is optimized for HK’s enhanced firing pin protrusion. This is not a modified AR-15 trigger shoe; it is a dedicated MR-platform design.

• Three-position selector: safe, semi-automatic, forced-reset mode
• Drop-in installation with included pins and springs—no gunsmithing required
• Single-stage trigger pull with a clean break and positive reset feel
• Hardened steel construction with a matte black finish
• Designed exclusively for HK MR223 and MR556 models

Every unit is assembled and function-tested at Rare Breed’s facility. The trigger pack fits the MR223 and MR556 lower receiver without modification, and the hammer profile clears the bolt carrier’s rear lug under all conditions. Because the FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 is a self-contained cassette, you can swap it in minutes and return to factory configuration just as quickly.

Who It’s For

This trigger is for HK MR223 and MR556 owners who want a faster cyclic rate without converting to a full-auto lower or dealing with exotic bolt carriers. It suits competitive shooters running three-gun or rifle matches who need a competitive edge in split times while staying within semi-automatic rules. It also appeals to enthusiasts who enjoy the mechanical feel of a forced-reset system and appreciate the engineering that goes into a purpose-built MR-platform trigger. If you already own an MR556 and have been looking for a way to push the platform’s speed without compromising its legendary reliability, the FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 is a straightforward upgrade. It is not a training device; it is a performance part for experienced shooters who understand manual of arms and trigger discipline.

• HK MR223 and MR556 owners
• Competitive rifle shooters in sanctioned matches
• Collectors and builders of high-end HK-platform rifles
• Shooters familiar with forced-reset trigger operation

Shipping & FFL

This trigger ships directly to your door. No FFL transfer is required because it is a firearm component, not a receiver or complete firearm. Federal law treats drop-in triggers as standard parts, so you do not need to involve a dealer for transfer. Check your state and local laws before ordering. Some jurisdictions restrict forced-reset triggers or three-position selectors. It is your responsibility to know and comply with all applicable regulations.

• Ships via UPS or FedEx with adult signature required
• No FFL transfer needed for shipment to residential addresses
• Not available for shipment to restricted states or localities

If you have questions about compatibility with your specific MR223 variant or need help confirming legality in your area, reach out to our customer service team before placing your order. We are here to help you get the FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 installed and running without hassle.