The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 comes complete with essential parts as described: FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 Overview Designed specifically for the HK MR223 and HK MR556 platforms, the Rare Breed FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 sets a new standard for performance-driven AR-pattern trigger systems. This drop-in unit retains the familiar HK push-pin geometry while integrating Rare Breed’s patented forced reset technology across three distinct selector positions. Engineered for shooters who demand consistent binary-like function without modifying the host firearm’s lower receiver, the FRT-MR3™ is built from heat-treated tool steel components and precision-ground sear surfaces. Each unit is hand-assembled and tested at Rare Breed’s US facility to ensure reliable reset under varied firing conditions. The FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 requires no permanent alterations to your rifle and installs in under ten minutes with standard hand tools. Features & Specs Three-position selector: safe, semi-automatic, and forced-reset mode; forced-reset position delivers a single-stage break with positive mechanical reset upon bolt carrier return. Drop-in design uses HK-specific pin diameters and housing dimensions for direct fit in MR223 and MR556 lower receivers without adapters or modifications. Manufactured from 4140 steel with QPQ nitride finish; internal springs are chrome-silicon wire for sustained cycle life beyond 20,000 rounds. Trigger pull weight factory-set at 4.5 to 5.5 pounds with minimal overtravel; sear engagement surfaces are wire-EDM cut to 0.001-inch tolerance. Includes anti-walk trigger and hammer pins with KNS Precision-style retention; all fasteners are Grade 8 zinc-plated steel. The FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 operates by using the bolt carrier’s forward motion to reset the trigger sear, allowing the shooter to maintain finger contact through the reset cycle. This mechanical action is entirely spring-driven and does not rely on gas system tuning or buffer weight changes. Each unit ships with a printed installation guide, a Rare Breed decal, and a lifetime warranty against manufacturing defects. Who It's For This trigger is intended for experienced shooters who own a HK MR223 or MR556 and seek a forced reset system that preserves the original rifle’s reliability and accuracy. It suits competition shooters in open divisions where forced reset triggers are permitted, as well as collectors and enthusiasts who want a documented, production trigger from a US manufacturer. The FRT-MR3™ single-stage (3-position) forced reset trigger for the HK MR223 & HK MR556 is not recommended for builds using aftermarket lower receivers with non-standard pin spacing or trigger pocket dimensions. Always verify your lower receiver’s compatibility with Rare Breed’s published fitment notes before installation. For duty or self-defense applications, confirm that your agency or local jurisdiction authorizes forced reset trigger systems. Shipping & FFL This item ships directly to your doorstep. No Federal Firearms License (FFL) transfer is required for purchase because the FRT-MR3™ is a firearm component, not a receiver or complete firearm. Shipping is via UPS Ground or USPS Priority Mail with adult signature required. Estimated delivery is 3 to 7 business days after order processing. International shipping is not available. The buyer is solely responsible for confirming that possession and use of forced reset triggers complies with all applicable state and local laws. Rare Breed recommends consulting with a qualified attorney before purchase if you are uncertain about your jurisdiction’s regulations. By placing an order, you certify that you are at least 18 years of age and not prohibited from owning firearm parts under federal or state law. This product is sold as a drop-in trigger assembly with no warranty expressed or implied regarding legality of use in any specific jurisdiction. Return requests must be initiated within 14 days of delivery and are subject to a 15 percent restocking fee; opened or installed triggers are not returnable.

No. This product is a part or accessory and does not require an FFL for purchase or shipping.

While FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is legal in most states, always verify your local laws before placing an order. We comply with all state regulations.

In most cases, yes — Glock-compatible frames are designed to accept Glock OEM and compatible magazines. Always confirm fitment in the product details.

That depends on your state’s concealed carry laws. Once properly serialized and registered, carrying may be allowed under state law.

We ship all over the USA within 1–3 business days. You will receive tracking once shipped. Delivery times vary by carrier and region.