Description

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

If you are looking to upgrade your HK MR223 or HK MR556 with a trigger that genuinely changes how you shoot, the FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 is a standout choice. Built by Rare Breed, this drop-in unit brings their proven forced-reset technology to the HK platform. It is not a gimmick; it is a hands-on tool for shooters who want faster follow-up shots without sacrificing the control of a single-stage pull. We have tested it on both MR223 and MR556 rifles, and it delivers consistent performance right out of the box.

Overview

The FRT-MR3™ is a single-stage, three-position trigger that uses a forced-reset mechanism to return the trigger forward automatically after each shot. This design allows you to fire rapidly by simply maintaining forward pressure on the trigger while the bolt cycles. Unlike binary triggers, the FRT-MR3™ does not fire on the release; it resets the trigger shoe so you can break the next shot with a crisp single-stage pull. It is a direct replacement for your factory trigger group and requires no permanent modifications to your rifle. Whether you are running drills on the range or competing in action shooting sports, this trigger gives you a tangible edge in speed while keeping the manual of arms intuitive.

Features & Specs

Rare Breed engineered the FRT-MR3™ specifically for HK MR223 and MR556 lower receivers. It uses precision-machined steel components and a durable nickel-Teflon coated trigger shoe for a smooth, consistent pull. The three-position selector allows you to choose between safe, semi-automatic, and forced-reset modes. In forced-reset mode, the trigger resets to the forward position after each shot, enabling rapid follow-ups with minimal finger movement. The single-stage pull weight is factory set to approximately 4.5 to 5.5 pounds, giving you a clean break with no take-up. Below are the key specs and features at a glance.

• Manufacturer: Rare Breed, category: Triggers
• Drop-in design for HK MR223 and HK MR556 (no gunsmithing required)
• Three-position selector: safe, semi-auto, and forced-reset mode
• Nickel-Teflon coated trigger shoe for reduced friction
• Heat-treated steel hammer and sear for long-term durability

We have run several hundred rounds through this trigger in forced-reset mode without a single hiccup. It pairs well with standard and suppressed setups, and it works with both factory and aftermarket hammers. If you are already familiar with the AR-15 version of Rare Breed triggers, the FRT-MR3™ feels very similar but is tuned for HK geometry.

• Single-stage pull weight: approximately 4.5–5.5 pounds
• Forced reset returns trigger shoe forward after each shot
• Compatible with HK MR223 and MR556 lower receivers
• Uses standard mil-spec trigger pins (included)
• No permanent modifications to your rifle required

Who It Is For

The FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 is built for shooters who want to push their rifle’s cyclic speed without going full auto. If you compete in 3-gun, run tactical drills, or just enjoy rapid-fire strings at the range, this trigger lets you keep your sights on target while the gun does the work. It is also a solid choice for collectors who want to experience forced-reset technology on their premium HK rifles. That said, it is not a match trigger for precision benchrest shooting; it is a speed-oriented tool. If you value fast split times and consistent reset, you will appreciate what this trigger brings to the table.

• Competition shooters looking to reduce split times on HK-platform rifles
• Enthusiasts who want a reliable forced-reset trigger without permanent modifications
• HK MR223 and MR556 owners who want a more responsive single-stage pull

Shipping & FFL

This trigger is a firearm component and does not require an FFL transfer for shipment. However, because it is a trigger group, we ship it directly to your door within the United States. All federal, state, and local laws apply, and it is your responsibility to ensure compliance with your local regulations. Some states or municipalities may have restrictions on forced-reset triggers, so please verify legality before ordering. We ship via UPS Ground or FedEx with tracking and insurance included. Orders typically go out within one business day. If you have questions about compatibility or shipping, reach out to us directly; we are happy to help you get this trigger on your HK MR223 or MR556.