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 is a precision-engineered drop-in trigger system developed by Rare Breed. Designed exclusively for the HK MR223 and HK MR556 platforms, this trigger represents a significant advancement in forced reset trigger technology. The FRT-MR3™ utilizes a three-position selector configuration that provides the operator with safe, semi-automatic, and forced-reset firing modes. Each unit is machined from billet steel and undergoes individual quality assurance testing to ensure consistent reset force and sear engagement. This trigger is purpose-built for the MR223 and MR556 lower receiver geometry, requiring no modification to the host firearm.

Features & Specs

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 incorporates Rare Breed’s proprietary forced-reset mechanism within a single-stage pull profile. The trigger bow is CNC-machined from 4140 steel with a QPQ corrosion-resistant finish. The hammer is constructed from hardened tool steel with a precision-ground sear surface. All internal springs are chrome-silicon wire for extended cycle life. The three-position selector provides positive detent engagement at each stop.

• Three-position selector: safe (rear), semi-automatic (center), forced-reset (forward)
• Single-stage pull weight: 4.5 to 5.5 pounds as measured from the factory
• Drop-in design: includes trigger, hammer, disconnector, sear, selector, and all pins
• Housing dimensions: mil-spec trigger pocket compatible with HK MR223 and MR556 lowers

• Material: 4140 steel trigger body, hardened tool steel hammer, stainless steel sear
• Finish: QPQ nitride on all steel components, black oxide on selector
• Operating temperature range: -20 degrees Fahrenheit to 160 degrees Fahrenheit
• Manufacturer: Rare Breed, Category: Triggers

• Patent-pending forced-reset mechanism with captive spring assembly
• Each unit serialized and test-fired prior to packaging
• Includes installation tool, replacement selector detent spring, and instruction manual
• Designed for semi-automatic fire control group replacement only

Who It’s For

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is intended for experienced shooters who own HK MR223 or HK MR556 rifles and require a robust, repeatable trigger system with a defined forced-reset function. This product is suitable for range use, training applications, and competition where forced-reset trigger systems are permitted. The trigger is not designed for duty or defensive carry applications. Users must verify that their specific host firearm is an HK MR223 or HK MR556 model, as the trigger geometry is specific to these lowers and will not function in AR-15 platforms without modification. Shooters should be familiar with the operation and maintenance of forced-reset trigger systems prior to installation.

Shipping & FFL

This FRT-MR3™ trigger is classified as a firearm component and ships directly to the customer’s provided address. No Federal Firearms License (FFL) transfer is required for this product as it is not a firearm frame or receiver under current ATF regulations. However, it is the purchaser’s sole responsibility to verify all applicable federal, state, and local laws regarding the ownership, possession, and use of forced-reset trigger systems before placing an order. Some jurisdictions may restrict or prohibit the sale or possession of this item. By purchasing this product, the buyer certifies that they are legally eligible to possess this component and that they will comply with all applicable laws. Rare Breed and this retailer assume no liability for misuse or non-compliance with local regulations. Standard shipping rates apply, with delivery typically within 3 to 7 business days to the contiguous United States.