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

If you own an HK MR223 or MR556, you already know the platform demands precision components. The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 delivers exactly that, designed specifically for the MR-series lower receiver geometry. This is not a one-size-fits-all trigger. Rare Breed engineered this unit to drop directly into your HK without modifications, giving you a forced-reset trigger system that feels both deliberate and fast. Whether you are running drills at the range or building a dedicated competition rifle, this trigger brings a unique mechanical action that rewards controlled input.

Overview

The FRT-MR3™ is a three-position, single-stage forced reset trigger built exclusively for the HK MR223 and MR556 platforms. Unlike standard triggers, the forced reset mechanism physically pushes the trigger shoe forward after each shot, requiring you to maintain consistent finger pressure for follow-up shots. The flat shoe offers a consistent finger placement point, reducing pull variation. This trigger uses Rare Breed’s proven sear geometry, adapted for the HK trigger pack dimensions. It ships as a complete drop-in unit with the housing, hammer, trigger shoe, and all internal components pre-assembled.

Features & Specs

• Single-stage, 3-position selector: Safe, Semi, and Forced-Reset mode. The forced-reset position is clearly marked and engages only when the selector is rotated fully forward.
• Manufactured by Rare Breed. Category: Triggers. Complete drop-in assembly for HK MR223 and MR556 lowers. No filing, fitting, or aftermarket pins required.
• Flat trigger shoe with serrated face for positive traction. Pull weight is factory set at approximately 4.5 to 5.5 pounds in forced-reset mode. Semi-automatic mode functions as a standard single-stage trigger.

The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 uses a captured reset spring that returns the trigger shoe forward faster than a conventional trigger return spring. This mechanical advantage is what enables the forced-reset cycling. All internal surfaces are finished with a corrosion-resistant coating, and the hammer is designed to reliably ignite both military-spec and commercial primers. The entire assembly is built to withstand the HK’s high-pressure gas system without degradation over thousands of rounds.

Who It’s For

This trigger is intended for experienced shooters who understand manual of arms for forced-reset systems. It suits competitors who want faster follow-up shots without moving to a binary or full-auto setup. It also appeals to HK enthusiasts who value mechanical innovation and want to explore the MR platform’s full potential. Law enforcement and professional users who train on forced-reset mechanics will find the MR3’s consistent sear engagement predictable under rapid fire. If you are new to forced-reset triggers, expect a learning curve: the trigger requires you to ride the reset rather than slap it. The flat shoe makes this easier to feel through the pad of your finger.

Shipping & FFL

This FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is classified as a firearm component and does not require transfer through a Federal Firearms License (FFL) for shipment within the United States. It ships directly to your door via common carrier. However, local, state, and municipal laws vary. You are responsible for ensuring compliance with all applicable regulations before ordering. Some states restrict or prohibit forced-reset triggers. Rare Breed and this retailer assume no liability for purchases made in jurisdictions where this product is not permitted. By completing your purchase, you confirm that you are legally allowed to own this item. No returns on installed triggers. Please verify your state and local laws prior to placing an order.