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

Overview

If you’ve been looking to upgrade your HK MR223 or HK MR556 with a trigger that delivers a distinct shooting experience, the FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 is worth a close look. Built by Rare Breed—a manufacturer known for pushing trigger innovation—this drop-in unit offers a three-position selector that gives you safe, semi-automatic, and forced-reset modes. The forced-reset function uses the bolt’s forward movement to mechanically reset the trigger shoe, allowing for rapid follow-up shots without modifying the rifle’s internal fire control group. It’s a hands-on upgrade that changes how you interact with the platform.

Features & Specs

The FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 is designed for shooters who want a crisp, predictable trigger pull with an aggressive reset. Here’s what you’re working with:

• Three-position selector: Safe, semi-automatic, and forced-reset mode. The forced-reset position re-engages the trigger after each shot as the bolt carrier cycles forward.
• Drop-in installation: No gunsmithing required for most MR223 and MR556 lowers. The trigger housing is pre-assembled and fits into standard mil-spec pockets.
• Single-stage design: A clean break with minimal take-up, paired with a positive reset that’s easy to feel under recoil.

• Durable construction: Heat-treated steel components with a corrosion-resistant finish, built to handle the HK’s high-pressure gas system.
• Compatibility: Specifically engineered for the HK MR223 and HK MR556 platforms. Not designed for AR-15 pattern rifles.
• Rare Breed quality control: Each trigger is test-fired before shipping to ensure consistent performance out of the box.

Who It’s For

This trigger is for the experienced MR223 or MR556 owner who wants to push the rifle’s speed potential in a controlled, legal manner. If you’re a competitive shooter working on split times, a trainer drilling rapid target transitions, or a collector who appreciates mechanical innovation, the FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 gives you a new tool to work with. It’s also a solid choice for anyone who simply enjoys the tactile feedback of a forced-reset system—the trigger resets itself under your finger, so you’re always ready for the next pull. Just be aware that this is not a standard single-stage trigger; it requires some practice to get the most out of the forced-reset mode. If you prefer a traditional trigger with a manual reset, this might not be your ideal fit.

Shipping & FFL

This item ships directly to your door from our warehouse. No FFL transfer is required for this trigger because it is classified as a firearm component, not a firearm receiver. However, please confirm that the forced-reset function is legal in your state and local jurisdiction before ordering. Some states have restrictions on triggers that modify the rate of fire. We cannot ship to addresses where such devices are prohibited. If you have any questions about compliance, reach out to our customer service team before completing your purchase.

• Shipping: Free standard shipping within the continental U.S. Orders typically leave within 1–2 business days.
• Return policy: Unopened, unused triggers can be returned within 30 days for a refund. Opened or installed triggers are not eligible for return due to safety and regulatory considerations.
• FFL disclaimer: No FFL transfer is required for this product as it is a trigger assembly. You are responsible for knowing and following all federal, state, and local laws regarding trigger ownership and use.