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 assembly manufactured by Rare Breed. This trigger system is designed exclusively for the HK MR223 and HK MR556 platform, utilizing the standard MR-series lower receiver geometry without requiring permanent modification. The FRT-MR3™ operates on a forced-reset mechanical principle, where the trigger resets forward under spring tension immediately following the bolt carrier group’s rearward travel, enabling a controlled cyclic rate that the shooter manages through trigger finger manipulation. The three-position selector provides safe, semi-automatic, and forced-reset functionality, with each position clearly indexed for unambiguous selection.

Features & Specs

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is manufactured to Rare Breed’s exacting tolerances, using heat-treated steel components and a nickel-Teflon coated trigger and hammer for reduced friction and consistent sear engagement. The single-stage pull weight is calibrated at approximately 4.5 to 5.5 pounds, with a crisp break and minimal overtravel. The housing is CNC-machined from 7075-T6 aluminum with a hard-coat anodized finish, matching the MR-series receiver’s corrosion resistance and dimensional stability.

• Three-position selector: Safe, Semi-Automatic, Forced Reset (FRT) mode
• Nickel-Teflon coated trigger shoe and hammer for consistent pull weight and corrosion resistance
• 7075-T6 aluminum housing with MIL-SPEC Type III hard-coat anodizing
• Drop-in design: no gunsmithing, pin fitting, or permanent receiver modification required
• Included anti-walk trigger pins with set screws for secure retention in the HK MR223/MR556 lower
• Heat-treated and stress-relieved sear, disconnector, and hammer components

Who It’s For

This FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is intended for shooters who own an HK MR223 or HK MR556 rifle and require a trigger system that delivers repeatable, high-speed semi-automatic fire while maintaining positive sear control. It suits competitive shooters in USPSA or 3-Gun divisions that permit forced-reset triggers, as well as advanced recreational shooters who prioritize trigger consistency and reduced lock time over standard mil-spec trigger packs. The FRT-MR3™ is not designed for duty, law enforcement, or military applications where select-fire capability is required. It is a semi-automatic-only accessory that complies with current BATFE rulings on forced-reset trigger mechanisms as of the date of manufacture.

• Owners of HK MR223 or HK MR556 rifles seeking a precision single-stage trigger
• Shooters who train on rapid semi-automatic follow-up shots and target transitions
• Competitors requiring a trigger with a short, repeatable reset and consistent pull weight
• Enthusiasts who value the mechanical feedback of a forced-reset trigger system

Shipping & FFL

This FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is classified by the ATF as a firearm component and does not require transfer through a Federal Firearms License (FFL) dealer when shipped to the end user in most states. However, certain states and localities have enacted restrictions on forced-reset trigger devices. It is the purchaser’s sole responsibility to verify that this trigger is legal to own, possess, and install in their jurisdiction before placing an order. We ship via UPS Ground or FedEx Ground with adult signature required. International shipping is not available. Returns are accepted within 30 days of delivery if the product is unused and in its original packaging, subject to a 15% restocking fee. For complete terms, please review our return policy.

• No FFL transfer required for shipment to most US addresses—check your local laws
• Adult signature required upon delivery
• 30-day return window for unused, unmodified triggers in original packaging
• Cannot ship to PO boxes, APO/FPO addresses, or outside the United States