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

Overview

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 represents a precision-engineered upgrade from Rare Breed, designed specifically for the HK MR223 and MR556 platform. This trigger system operates through a patented forced-reset mechanism that allows the shooter to achieve rapid follow-up shots by utilizing the trigger’s reset cycle as part of the firing sequence. Unlike traditional triggers, the FRT-MR3™ provides three distinct selector positions: Safe, Semi-Automatic, and Forced Reset. Each position is clearly defined and mechanically distinct, giving the operator full control over the trigger’s behavior. Rare Breed has built its reputation on reliable, drop-in trigger systems that do not require permanent modification to the host firearm. The FRT-MR3™ continues that tradition with a housing that fits standard HK MR223 and MR556 lower receivers without any fitting or gunsmithing. For the civilian shooter who demands maximum performance from their HK-pattern rifle, this trigger is a direct path to enhanced cyclic control.

Features & Specs

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is built from heat-treated steel components with a corrosion-resistant finish. It is a single-stage trigger with a consistent pull weight that does not require adjustment out of the box. The forced-reset position utilizes a patented cam system that resets the trigger forward immediately after each shot, allowing the shooter to maintain trigger contact throughout the firing cycle. This design eliminates the need for the shooter to fully release the trigger between shots, reducing split times while maintaining positive control. The three-position selector is clearly marked and provides tactile feedback between each position. The trigger is a direct drop-in replacement for the factory trigger group in HK MR223 and MR556 rifles. Installation requires no permanent modification, drilling, or filing. All components are CNC-machined to MIL-SPEC tolerances and assembled in the United States.

• Drop-in design: No permanent modification required for HK MR223 and MR556 lower receivers.
• Three-position selector: Safe, Semi-Automatic, and Forced Reset with distinct mechanical stops.
• Patented forced-reset cam system: Trigger resets forward automatically after each shot during forced-reset operation.

• Single-stage trigger pull: Consistent weight with no take-up or over-travel adjustment needed.
• Heat-treated steel construction: Corrosion-resistant finish rated for extended service life.
• CNC-machined components: Manufactured in the United States to Rare Breed specifications.

Who It’s For

This trigger is intended for experienced shooters who own an HK MR223 or HK MR556 and have a working understanding of advanced trigger systems. It is designed for those who train regularly and want to improve their rate of fire without switching to a full-automatic platform. The FRT-MR3™ is suitable for competitive shooters in divisions that allow forced-reset triggers, as well as for private range use where local laws permit. It is not a training device for inexperienced shooters. The mechanical operation of the forced-reset position requires deliberate trigger control and should only be used by individuals who have read the manufacturer’s instructions and practiced with the safe and semi-automatic positions first. This product is for the shooter who values mechanical precision and is willing to invest in a dedicated trigger system for their HK-pattern rifle.

Shipping & FFL

This FRT-MR3™ 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 to your door in most states. However, it is the buyer’s sole responsibility to verify that this product is legal to own and use in their specific jurisdiction. Some states and localities have enacted laws that restrict or prohibit the possession of forced-reset triggers. By purchasing this item, you acknowledge that you are in compliance with all applicable federal, state, and local laws. We reserve the right to refuse shipment to jurisdictions where this product is restricted. Standard shipping rates apply, and orders are processed within one to two business days. If you have any questions about the legal status of this product in your area, consult with a local attorney before placing an order.

• No FFL required for shipment to most states; buyer must verify local legality.
• We reserve the right to refuse orders to restricted jurisdictions.
• Standard shipping rates apply; orders ship within 1-2 business days.