Description

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

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 represents a precision-engineered upgrade for discerning shooters who demand consistent, repeatable trigger performance from their HK-pattern rifles. Manufactured by Rare Breed, this forced reset trigger system is designed specifically for the MR223 and MR556 platforms, offering a drop-in solution that leverages the mechanical forced reset principle to deliver rapid follow-up shots without modifying the host firearm’s lower receiver. The flat shoe profile provides a consistent finger placement surface, reducing shot-to-shot variation during high-volume strings.

Overview

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a three-position selectable trigger system that operates on a forced reset mechanism. Unlike traditional binary or standard semi-automatic triggers, the forced reset design uses the bolt carrier’s forward motion to physically reset the trigger shoe after each discharge. This mechanical interlock enables the shooter to achieve an elevated rate of fire through controlled trigger manipulation while maintaining semi-automatic functionality in position 1. Positions 2 and 3 provide additional operating modes that adhere to ATF technical classifications for forced reset triggers. The flat trigger shoe is machined from billet aluminum with a hardcoat anodized finish, ensuring durability under sustained use. Each unit is assembled with precision-ground sear engagement surfaces and a reinforced hammer spring to guarantee positive primer strikes across varied ammunition types.

Features & Specs

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 incorporates a single-stage pull with a consistent 4.5 to 5.5-pound break weight, measured at the center of the flat shoe. Key specifications include:

• Manufacturer: Rare Breed | Category: Triggers | Platform Compatibility: HK MR223, HK MR556
• Three-position selector with forced reset functionality in positions 2 and 3; position 1 provides standard semi-automatic fire
• Flat trigger shoe geometry with 0.30-inch width, 0.125-inch thickness, and integral over-travel stop set to 0.020-inch clearance
• Drop-in design requiring no permanent modification to the lower receiver; includes stainless steel pins and anti-walk retaining clips
• Heat-treated tool steel sear and hammer components with a case hardness of 58-60 HRC; nickel-Teflon coating on all internal contact surfaces

Additional technical details include a hammer fall time of 8.5 milliseconds at 70 degrees Fahrenheit, a trigger reset distance of 0.100 inches measured from the sear engagement point, and a total trigger travel of 0.180 inches to hammer release. The housing is constructed from 7075-T6 aluminum with a Type III Class 2 hardcoat anodize finish in matte black. The assembly weighs 3.2 ounces and includes a complete trigger cassette, selector lever, and installation hardware.

• Forced reset mechanism cycles at a mechanical rate limited by bolt carrier velocity; no electronic components or batteries required
• Positive reset feedback through the trigger shoe with audible and tactile confirmation of sear re-engagement
• Tested to 10,000 cycles without measurable wear on sear engagement surfaces; hammer spring rated for 50,000 compressions

Who It’s For

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is intended for experienced shooters who require a high-performance trigger system for competitive shooting disciplines, training evolutions, or firearms research and development. This component is designed for individuals who understand the mechanical operation of forced reset triggers and can demonstrate safe handling practices at elevated firing rates. It is suitable for owners of HK MR223 or MR556 rifles who seek to maximize the platform’s cyclic potential through a drop-in trigger upgrade that preserves the factory lower receiver geometry. The flat shoe benefits shooters who prefer a consistent, low-friction surface for finger placement during rapid fire sequences.

Shipping & FFL

This product is a firearm component and does not constitute a firearm as defined by the Gun Control Act of 1968. It ships directly to residential or business addresses within the United States where local and state laws permit possession. No Federal Firearms License (FFL) transfer is required for purchase or shipment. However, purchasers are solely responsible for verifying that this trigger system complies with all applicable federal, state, and local regulations, including any restrictions on forced reset trigger devices. Rare Breed and this retailer assume no liability for improper installation or use. Standard shipping rates apply; expedited options are available at checkout.

• No FFL transfer required for this trigger component; ships directly to your address
• Buyer must confirm legal compliance with all local, state, and federal laws prior to ordering
• Installation should be performed by a qualified gunsmith or experienced armorer; improper installation may affect firearm function