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 is a purpose-built upgrade for shooters who demand precision and mechanical consistency from their HK-pattern rifles. Rare Breed designed this trigger specifically around the proprietary bolt carrier geometry and hammer clearance of the MR223 and MR556 platforms. It is not a generic drop-in—it is engineered to fit these rifles without modification to the lower receiver or bolt carrier group.

This trigger operates on a forced-reset principle: after each shot, the trigger blade physically resets forward under spring tension, requiring the shooter to release pressure before the next round can fire. The result is a crisp, repeatable break with a short reset that keeps you on target. The flat trigger shoe provides a consistent finger placement, reducing pull variation during rapid strings. If you are looking for a performance trigger that respects the mechanical limits of your HK, this is it.

Overview

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a three-position select-fire trigger system. Position one is safe. Position two is semi-automatic (standard single-shot per trigger pull). Position three activates the forced-reset function, where the trigger resets automatically upon bolt return, allowing for rapid follow-up shots while maintaining a mechanical, user-controlled cadence. This is not a binary trigger and does not produce automatic fire. It is a forced-reset trigger that requires deliberate finger manipulation for each shot cycle.

Features & Specs

This trigger is built around the MR223 and MR556 bolt carrier dimensions, ensuring proper hammer engagement and reliable ignition. The flat trigger shoe reduces over-travel and provides a consistent surface for gloved or bare-handed use.

• Three-position selector: Safe, Semi, and Forced-Reset. The forced-reset position engages a spring-loaded plunger that physically pushes the trigger forward after each hammer fall.
• Single-stage design with a clean 4.5 to 5.5 pound pull weight. No take-up creep. The break is predictable and repeatable.
• Flat trigger profile with a textured face for positive finger placement. The shoe is machined from billet steel and finished with a corrosion-resistant QPQ coating.

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 includes all necessary pins, springs, and anti-walk retainers. Installation requires basic armorer tools and mechanical familiarity with the HK lower receiver. No permanent modifications to the receiver or bolt carrier are needed.

• Manufacturer: Rare Breed
• Category: Triggers
• Platform compatibility: HK MR223 and HK MR556 only. Not compatible with AR-15 or standard HK416 pattern lowers without confirmed bolt carrier geometry.

Who It Is For

This trigger is for the HK owner who wants to maximize the mechanical performance of their rifle without converting it to a different operating system. It suits competitive shooters who need fast, controlled splits in three-gun or tactical rifle matches, as well as enthusiasts who appreciate the engineering behind forced-reset mechanics. If you run a suppressed MR556 with a high-speed bolt carrier, this trigger maintains consistent hammer follow-through. It is also appropriate for trainers who teach trigger discipline under rapid fire conditions, as the forced-reset function provides clear tactile feedback for each shot cycle.

This is not a trigger for casual plinkers or those who prefer a light, two-stage match trigger. It is a single-stage, performance-oriented system that demands a deliberate shooting technique. If you understand how forced-reset triggers work and want one built specifically for your HK, this is the correct choice.

Shipping & FFL

This FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a firearm component and ships directly to your doorstep. No Federal Firearms License (FFL) transfer is required for this item because it is not classified as a firearm frame or receiver by the ATF. However, you must comply with all local, state, and federal laws regarding trigger installation and use. Some states and municipalities restrict or prohibit forced-reset triggers. It is your responsibility to verify legality in your jurisdiction before ordering. Rare Breed and our retailer assume no liability for improper installation, misuse, or legal non-compliance.

• Ships via UPS Ground or FedEx Home Delivery with adult signature required.
• No FFL needed for purchase or delivery. Installation is user-level.
• Check your local laws. Forced-reset triggers may be restricted in certain states including, but not limited to, California, New York, New Jersey, and Washington D.C.