Description

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

The Rare Breed FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger is a precision-engineered drop-in upgrade engineered exclusively for the HK MR223 and HK MR556 platforms. Designed for shooters who demand rapid, repeatable shot cycles without sacrificing control, this trigger system replaces your factory unit with a flat-faced, three-position selector that delivers a forced-reset function in the third position. Built to the exacting standards of Rare Breed, this component is intended for legal use in semi-automatic configurations where permitted by local, state, and federal law. Alabama shooters will appreciate the direct, mechanical reliability this trigger provides, whether on the range or in a defensive carbine setup.

Overview

The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 represents a significant advancement in trigger technology for the HK platform. Unlike conventional triggers, this system uses a forced-reset mechanism that actively returns the trigger forward after each shot, allowing the shooter to maintain a consistent shooting cadence. The flat trigger face provides a consistent finger placement point, reducing variability in pull weight and travel. This is not a binary trigger or a full-auto conversion device; it is a drop-in trigger that operates within the legal framework of a semi-automatic firearm. The three-position selector includes safe, semi-automatic, and the forced-reset position, giving the operator full control over the firing mode.

Features & Specs

Every aspect of the FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is manufactured to tight tolerances using heat-treated steel and aerospace-grade alloys. The flat trigger shoe reduces over-travel and provides a more natural finger interface. The forced-reset function is achieved through a patented cam system that re-engages the sear without requiring the shooter to fully release the trigger. Below are the key specifications and design elements.

• Manufacturer: Rare Breed
• Category: Triggers
• Platform Compatibility: HK MR223, HK MR556 (verified fitment; no modifications required)
• Trigger Type: Single-stage, forced reset (3-position selector: safe, semi, forced-reset)
• Trigger Shoe: Flat, serrated face for reduced slip
• Construction: Heat-treated steel hammer, sear, and disconnector; aluminum housing
• Pull Weight: Factory-set at approximately 4.5-5.5 lbs (not adjustable)
• Installation: Drop-in; no gunsmithing required for standard receiver fitment

The internal geometry is designed to work with the MR223 and MR556 bolt carrier group without binding or hesitation. The trigger resets audibly and tactilely, giving the shooter positive confirmation of the ready state. Each unit is inspected and test-fired before shipment.

Who It’s For

This trigger is intended for experienced shooters who own an HK MR223 or HK MR556 and are looking to upgrade their trigger system for faster, more consistent shot placement. It is suitable for competitive shooters in divisions that allow forced-reset triggers, as well as for enthusiasts who train for proficiency with rapid follow-up shots. Alabama residents should verify that the forced-reset function is permissible under their local ordinances and range rules. This product is not designed for novice shooters or for use in fully automatic firearms. The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a precision tool for those who understand the mechanical operation of their firearm and who comply with all applicable laws.

• Owners of HK MR223 or HK MR556 rifles
• Shooters seeking a repeatable, rapid shot cycle without full-auto
• Competitors in limited-class matches where forced-reset triggers are legal
• Individuals who prefer a flat trigger shoe for consistent finger placement

Shipping & FFL

This item is a firearm component and is not itself a firearm receiver. It does not require transfer through a Federal Firearms License (FFL) dealer. However, we strongly recommend that you consult with a qualified legal professional or your local FFL before purchase to confirm compliance with all state and local laws, including those specific to the State of Alabama. Rare Breed and this retailer assume no liability for improper use or installation. All sales are final. Standard shipping rates apply; expedited options are available at checkout. This product ships directly to your shipping address unless your jurisdiction requires an FFL intermediary. It is the buyer’s sole responsibility to ensure legal possession.

• No FFL required for transfer to the buyer (varies by jurisdiction)
• Buyer assumes all responsibility for legal compliance
• Not for use in full-automatic firearms or conversion devices