Description

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 significant engineering advancement in precision firearm control. Designed exclusively for the HK MR223 and HK MR556 platforms, this trigger system integrates Rare Breed’s proven forced-reset technology into a flat, single-stage configuration. The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 allows the shooter to select between semi-automatic, forced-reset, and safe positions, providing a distinct mechanical advantage through a rapid reset cycle that returns the trigger forward under spring tension immediately after each shot. This unit is machined from heat-treated 4140 steel with a QPQ corrosion-resistant finish, ensuring consistent performance under sustained live-fire conditions.

Overview

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a drop-in replacement assembly that does not require modification to the host firearm’s lower receiver. It operates on a cam-driven reset mechanism that physically forces the trigger forward after each discharge, reducing lock time and enabling faster, more controlled follow-up shots. The flat trigger shoe offers a consistent finger placement surface, minimizing variability in pull weight across multiple engagement cycles. This trigger is classified as a single-stage design with a factory-set pull weight of approximately 4.5 to 5.5 pounds, verified through Rare Breed’s quality control protocols.

Features & Specs

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 incorporates precision-machined internal components with a nickel-Teflon coated sear and hammer engagement surfaces. The three-position selector rotates through safe, semi-automatic, and forced-reset modes, with each position clearly indexed by a positive detent. The trigger housing is constructed from billet 7075-T6 aluminum, anodized to MIL-A-8625 Type III specifications.

• Three-position selector: Safe, Semi-Automatic, and Forced Reset modes
• Flat trigger shoe profile with serrated face for tactile consistency
• 4140 steel hammer, sear, and disconnect components with QPQ finish
• 7075-T6 aluminum housing with Type III hard coat anodizing
• Drop-in design; no gunsmithing or permanent modifications required
• Single-stage pull weight: 4.5–5.5 pounds (factory specification)

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is compatible with factory and aftermarket lower receivers that accept standard HK MR223/MR556 trigger groups. The hammer profile accommodates both mil-spec and enhanced firing pins without interference. All springs are constructed from chrome-silicon wire with a pre-set load to maintain consistent force through the trigger cycle.

Who It’s For

This trigger system is intended for competitive shooters participating in USPSA, 3-Gun, and tactical rifle matches who require a flat-shoe, single-stage trigger with a mechanical forced-reset function. It is also suitable for firearms instructors and armorers who demand repeatable trigger pull characteristics and rapid follow-up shot capability during training evolutions. The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is not classified as a machine gun or part of a machine gun under federal law, as it relies on the shooter’s trigger finger to initiate each cycle. Users should verify compliance with all applicable state and local laws prior to purchase.

• Competitive shooters requiring a flat, single-stage trigger with forced-reset capability
• Firearms instructors and range officers conducting high-volume training sessions
• HK MR223 and MR556 owners seeking a mechanical trigger upgrade without modifying the receiver
• Armorers and custom builders looking for a drop-in, three-position trigger assembly

Shipping & FFL

This product is a firearm component and may be shipped directly to the purchaser in most jurisdictions. However, the FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 contains a hammer and trigger assembly that may be regulated as a firearm part in certain states, including California, New York, New Jersey, Connecticut, Maryland, Washington, and the District of Columbia. It is the responsibility of the buyer to confirm compliance with all local, state, and federal laws before placing an order. A Federal Firearms License (FFL) transfer is not required for this component in jurisdictions where it is not classified as a firearm receiver. All shipments are processed within 2–5 business days via UPS Ground with signature confirmation. No returns are accepted on installed or modified trigger assemblies.

• No FFL transfer required in most states; check local laws before ordering
• Not available for shipment to restricted jurisdictions without prior legal verification
• Signature confirmation required upon delivery
• All sales final on opened or modified units