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 operating these specific HK-platform rifles. Manufactured by Rare Breed, this trigger system is designed to integrate seamlessly with the HK MR223 and HK MR556 platforms, offering a distinct mechanical interface that prioritizes consistent performance and repeatable operation. The forced reset mechanism is a technically distinct design that requires the shooter to maintain deliberate trigger finger control, resetting the trigger forward under spring tension after each shot. This product is not a binary trigger, not a full-auto device, and is intended for use only in semi-automatic configurations where legal compliance is strictly observed.

Overview

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a drop-in assembly that replaces the factory trigger group without permanent modification to the lower receiver. The three-position safety selector provides safe, semi-automatic, and forced-reset modes, allowing the operator to select the appropriate setting based on range conditions or training objectives. The flat trigger shoe is contoured for a consistent finger placement, reducing pull weight variation and enabling more predictable trigger breaks. This trigger is built from heat-treated steel components with a corrosion-resistant finish, ensuring longevity under high-round-count use. The forced reset function is mechanically actuated by the bolt carrier, not by gas or recoil, which distinguishes it from other rapid-fire systems. All components are machined to tight tolerances to minimize overtravel and creep, providing a clean, single-stage break in both standard and forced-reset modes.

Features & Specs

• Three-position safety selector: Safe, Semi, and Forced Reset positions, with positive detent engagement for tactile feedback
• Flat single-stage trigger shoe with a smooth, non-slip face, reducing finger fatigue during extended sessions
• Drop-in design for HK MR223 and HK MR556 lower receivers; no permanent modifications, filing, or gunsmith fitting required
• Manufactured by Rare Breed; category: Triggers; constructed from 4140 steel with a black nitride finish for wear resistance
• Forced reset mechanism engages only when the bolt carrier cycles fully; trigger resets under spring tension, not by release of the trigger shoe
• Pull weight factory set to approximately 4.5 to 5.5 pounds, measured with a digital gauge, with minimal variation across multiple pulls
• Includes all necessary pins, springs, and installation instructions; no special tools required for installation

Who It’s For

This trigger is designed for experienced shooters who own an HK MR223 or HK MR556 and seek a mechanically distinct training tool that emphasizes trigger discipline and manual cycling control. It is suitable for competitive shooters in divisions that permit forced-reset triggers, as well as for firearms enthusiasts who want to explore advanced manipulation techniques in a controlled environment. Law enforcement and military personnel training on HK-platform rifles may also find value in the forced-reset mode for drills that simulate rapid follow-up shots while maintaining semi-automatic compliance. This product is not recommended for novice shooters or for those who do not fully understand the legal and operational requirements of forced-reset trigger systems. Users must verify that their local, state, and federal laws permit the possession and use of this trigger before purchase.

Shipping & FFL

This FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is classified as a firearm part and does not require shipment to a Federal Firearms License (FFL) dealer for transfer. It can be shipped directly to your residential or business address within the United States, provided that the destination state and local laws do not restrict the sale or possession of such trigger components. However, it is the sole responsibility of the purchaser to confirm that their state and local jurisdictions allow the ownership and installation of forced-reset triggers. Some states, including but not limited to California, New York, New Jersey, Connecticut, Washington, and Illinois, may have specific restrictions or outright bans on this type of product. By purchasing this item, you certify that you are in compliance with all applicable laws. Rare Breed and the retailer assume no liability for any legal consequences resulting from the purchase, possession, or use of this trigger. Always consult with a qualified legal professional if you are uncertain about the legality of this product in your area.