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

If you run an HK MR223 or MR556, you already know the platform demands precision and durability. The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is purpose-built for these specific rifles, and it brings a distinct mechanical advantage to your shooting experience. Rare Breed designed this trigger to deliver reliable forced-reset functionality without sacrificing the clean, crisp break you expect from a single-stage unit. Whether you are running drills at the range or stacking rounds on steel, the FRT-MR3 gives you a consistent, repeatable pull that keeps your finger on the work.

Overview

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is not a general-purpose trigger. It is a dedicated drop-in assembly engineered to fit the HK MR223 and MR556 lower receivers without any modification. The trigger features a flat shoe, which provides a more consistent finger placement and a shorter reach for shooters who prefer a straight profile. The three-position selector allows you to choose between safe, semi-automatic, and forced-reset modes. In forced-reset mode, the trigger mechanically resets forward as the bolt cycles, enabling a rapid, controlled cadence that stays within legal parameters. This is a precision component for shooters who want to push their HK platform to its mechanical limits.

Features & Specs

Rare Breed built this trigger with a focus on reliability and longevity. The housing is machined from billet aluminum, and the internal components are heat-treated steel. The flat trigger shoe is skeletonized to reduce weight while maintaining rigidity. Here are the key specifications and features you need to know before you buy:

• Three-position selector: safe, semi-automatic, and forced-reset mode. The forced-reset function relies on the bolt carrier group traveling forward to mechanically reset the trigger shoe, allowing for a fast, consistent pull cycle.
• Flat trigger shoe with a smooth, textured face. The shoe design reduces finger fatigue during extended sessions and provides a repeatable placement point for each shot.
• Single-stage pull weight set between 4.5 and 5.5 pounds. The break is clean with minimal overtravel, and the reset is tactile and audible in semi-automatic mode.

Additional specs include a compact housing that fits standard HK MR223 and MR556 pocket dimensions. The trigger comes pre-assembled with all necessary pins and springs. Installation requires basic armorer tools and about fifteen minutes of your time. No permanent modifications to your lower receiver are needed.

• Drop-in design for HK MR223 and MR556. No filing, fitting, or drilling required. Simply remove your factory trigger group and install the FRT-MR3 unit.
• Heat-treated steel disconnector and sear surfaces. These components are case-hardened to resist wear from repeated forced-reset cycling.
• Nickel Teflon coated trigger and hammer for reduced friction and corrosion resistance. The coating also contributes to a smoother pull over the life of the trigger.

Who It Is For

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is for the shooter who wants to maximize the cyclic rate of their HK platform without compromising control or accuracy. It is suited for competition shooters who need fast follow-up shots on multiple targets, as well as serious enthusiasts who train for speed and efficiency. If you already own an MR223 or MR556 and you are looking for a trigger that offers a unique mechanical action beyond a standard single-stage or two-stage unit, this is a strong candidate. It is not a novelty item. It is a tool designed for shooters who understand trigger manipulation and want to refine their technique.

Shipping & FFL

This trigger ships directly to your door. No FFL transfer is required because it is not a firearm or a regulated lower receiver. Rare Breed classifies this as a firearm component, and federal law allows it to be shipped to your residence. However, you must comply with all state and local laws regarding trigger purchase and possession. Some states and municipalities have restrictions on forced-reset triggers or binary-style mechanisms. It is your responsibility to verify that this product is legal in your jurisdiction before placing an order. We ship via insured ground service, and tracking information is provided once the package leaves our warehouse.