Description

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 manufactured by Rare Breed. Designed exclusively for the HK MR223 and HK MR556 platforms, this trigger utilizes a forced-reset mechanism that returns the trigger forward under spring tension after each shot, enabling rapid semi-automatic fire without modifying the firearm’s classification. The unit features three selectable positions: Safe, Semi-Automatic, and Forced Reset. Each trigger is constructed from billet-machined 4140 steel and 7075-T6 aluminum components, with a nickel-Teflon coated sear and hammer for reduced friction and consistent engagement. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 maintains a single-stage pull weight of 4.5 to 5.5 pounds and is compatible with factory safety selectors. No permanent modification to the lower receiver is required for installation.

Features & Specs

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is built to exacting tolerances by Rare Breed, a manufacturer recognized for compliance-driven trigger engineering. Below are the key specifications and design details.

• Manufacturer: Rare Breed | Category: Triggers | Platform: HK MR223, HK MR556
• Three-position selector: Safe, Semi-Automatic, Forced Reset mode
• Single-stage trigger pull: 4.5 – 5.5 pounds (measured at trigger shoe center)
• Materials: Billet 4140 steel hammer and sear, 7075-T6 aluminum housing, nickel-Teflon coated engagement surfaces
• Drop-in design: No receiver modification or gunsmith fitting required; includes all pins and springs
• Patent-protected forced reset cam mechanism with positive reset confirmation
• Compatible with factory HK MR223 and MR556 safety selectors and bolt catch assemblies

Each FRT-MR3™ unit is individually function-tested at the factory to verify sear engagement, reset travel, and safety block performance. The trigger housing is machined to Mil-Spec dimensions for the HK 416-derived lower receiver pocket.

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 demand high-speed follow-up shot capability from a precision semi-automatic platform. This trigger is suited for competitive shooters in outlaw or open-division matches where forced-reset technology is permitted, as well as for training applications requiring rapid target transitions and split-time reduction. Owners of HK MR223 or MR556 rifles who prefer a single-stage trigger over two-stage designs will find the FRT-MR3™ a direct upgrade to the factory trigger pack. Users should have a working understanding of forced-reset mechanics and safe manipulation of the three-position selector under live fire conditions. This product is not designed for duty, law enforcement, or military applications where select-fire or burst-fire modes are required.

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) dealer for shipment. It may be shipped directly to a residential address in states where the product is legally permissible. The purchaser is solely responsible for confirming compliance with all local, state, and federal laws regarding the ownership and installation of forced-reset trigger systems. Some jurisdictions restrict or prohibit forced-reset triggers; it is the buyer’s obligation to verify legality before ordering. Standard shipping methods apply, and expedited options are available at checkout. No signature is required for delivery unless the shipping carrier mandates it for the destination address. Rare Breed warrants the FRT-MR3™ against manufacturing defects in materials and workmanship for one year from the date of purchase. Installation instructions and technical support are available through the manufacturer’s website.