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 for shooters seeking enhanced control and repeatable trigger mechanics. Manufactured by Rare Breed, a recognized name in the trigger category, this forced reset trigger system is purpose-built to interface directly with the HK MR223 and HK MR556 platforms. Unlike standard single-stage triggers, the FRT-MR3™ utilizes a three-position selector that allows the user to operate in safe, semi-automatic, or forced reset mode. The forced reset function mechanically returns the trigger forward after each shot, requiring the shooter to consciously release and reset the trigger before the next round can be fired. This design provides a distinct mechanical feel and a consistent pull weight, making the FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 a technical choice for those who prioritize trigger discipline and operational specificity.

Features & Specs

The FRT-MR3™ is constructed from heat-treated steel and billet aluminum components, ensuring dimensional stability under repeated use. The trigger housing is CNC-machined to tight tolerances, reducing slop and improving lockup with the HK lower receiver. The three-position selector is clearly marked and provides tactile detents for each mode. Below are the core specifications and design elements:

• Single-stage trigger mechanism with forced reset capability: the trigger must be fully released after each shot to reset the sear, preventing unintentional follow-through.
• Three-position selector: safe (blocked), semi-automatic (standard single-shot), and forced reset (mechanical reset cycle).
• Drop-in design for HK MR223 and HK MR556 variants; no permanent modification to the receiver required for installation.

Additional technical details include a pull weight of approximately 5.5 to 6.5 pounds in forced reset mode, and a trigger travel distance that is consistent across the semi-automatic and forced reset positions. The trigger shoe is flat-faced with serrations for positive finger placement. All springs and pins are included in the package.

• Material: 4140 steel hammer, 7075-T6 aluminum housing, stainless steel sear engagement surfaces.
• Compatibility: HK MR223, HK MR556, and variants using the same trigger group geometry.
• Weight: 3.2 ounces total assembly, including selector and retention pins.

Who It’s For

This trigger is intended for experienced shooters who own an HK MR223 or HK MR556 and are familiar with forced reset trigger operation. It is designed for range use, training environments, and competition where controlled shot placement and trigger manipulation are emphasized. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is not recommended for novice users or for applications requiring standard semi-automatic fire without manual reset. Shooters who understand the mechanical sequence of forced reset triggers will benefit from the consistent pull and the ability to toggle between firing modes without changing components. This trigger is a direct replacement for the factory trigger group and does not require additional adaptation parts.

Shipping & FFL

This product ships directly to your residential or business address. No Federal Firearms License (FFL) transfer is required for this trigger assembly, as it is classified as a firearm component and not a receiver or complete firearm. However, Illinois state law imposes specific restrictions on firearm parts and accessories. It is the purchaser’s sole responsibility to verify that the FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is lawful to own, possess, and install in your jurisdiction. Rare Breed triggers are not approved for use in all municipalities within Illinois. By purchasing this item, you confirm that you are not prohibited from owning firearm components under state or federal law, and that you will comply with all applicable local ordinances regarding trigger mechanisms and forced reset devices. We reserve the right to cancel any order that violates our compliance policies.

• Shipping method: UPS Ground or FedEx Home Delivery, signature required.
• Restocking fee: 15% on returned items; returns accepted within 30 days of delivery.
• FFL disclaimer: No FFL transfer required, but buyer assumes all legal responsibility for compliance with Illinois law.