Description

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

If you own an HK MR223 or MR556, you know the platform demands quality components. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is built specifically for that platform, delivering a unique shooting experience that bridges the gap between traditional semi-auto and forced-reset operation. Rare Breed engineered this trigger to work with the MR-series lower receiver geometry, so you get drop-in installation and reliable function without modification. Whether you are running drills at the range or testing your rifle’s limits, this trigger gives you tactile feedback and speed that feels natural in the hand.

Overview

The FRT-MR3™ is a single-stage, three-position trigger system designed exclusively for the HK MR223 and MR556. It operates in safe, semi-automatic, and forced-reset modes, giving you control over every shot. The forced-reset function uses the rifle’s cycling action to reset the trigger forward, allowing for rapid follow-up shots while maintaining the integrity of a semi-automatic action. This is not a binary trigger or a modification to the fire control group’s legal classification—it simply alters the trigger’s mechanical reset behavior. Rare Breed’s patent-pending design ensures consistent engagement and disengagement, shot after shot.

Features & Specs

Built from 4140 steel and hardened to military-grade specs, the FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is machined to tight tolerances. The trigger shoe is contoured for a comfortable finger placement, and the three-position selector is clearly marked for safe, semi, and forced-reset modes. Here is what you get out of the box:

• Drop-in design: no gunsmithing required; installs directly into standard MR223/MR556 lower receivers with factory pins
• Three-position selector: safe, semi-automatic (standard trigger reset), and forced-reset mode for rapid follow-up shots
• Single-stage pull with a crisp break: consistent trigger pull weight of approximately 5 to 6 pounds, with minimal creep

Additional specs include a nickel-Teflon coated trigger and hammer for reduced friction and corrosion resistance, plus a reinforced hammer spring to ensure reliable primer strikes with a wide range of ammunition. The entire assembly is built to withstand high-round-count use without losing timing or reset consistency.

Who It’s For

This trigger is for the experienced shooter who understands the mechanics of their rifle and wants to push performance without compromising reliability. If you own an HK MR223 or MR556 and already have a solid foundation in trigger control, the FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 will feel like a natural upgrade. It is not meant for beginners who are still learning safe handling basics, nor is it a substitute for proper training. Competitors, range enthusiasts, and collectors who appreciate the engineering behind forced-reset triggers will find this product fits their needs. It is also ideal for those who want to keep the same lower receiver platform while adding a new dimension to their shooting experience.

• Owners of HK MR223 or MR556 rifles looking for a drop-in trigger upgrade
• Shooters who want to experiment with forced-reset technology in a legal, semi-automatic configuration
• Firearm enthusiasts who value precision machining and durable materials in their fire control groups

Shipping & FFL

This trigger ships directly to your doorstep—no FFL transfer required. However, please verify your local and state laws before ordering, as some jurisdictions may have restrictions on forced-reset triggers or three-position selectors. Rare Breed triggers are designed to comply with federal regulations for semi-automatic firearms, but we recommend consulting with a qualified attorney if you have any doubts about your area’s requirements. We ship via UPS Ground or FedEx with tracking and signature confirmation. Orders typically leave our warehouse within two business days. If you need assistance with installation or have questions about compatibility with specific aftermarket parts, our support team is available by phone and email.

• No FFL transfer needed for trigger components; ships directly to your address
• Customer assumes responsibility for compliance with all applicable local, state, and federal laws
• Contact us before ordering if you are unsure about legal status in your location