Description

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

When you build around an HK MR223 or MR556, the trigger is the heart of your rifle’s performance. The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger from Rare Breed delivers a familiar, responsive pull that resets automatically under recoil, letting you stay on target without lifting your finger. Designed specifically for these HK platforms, this trigger uses the same forced reset mechanics that have made Rare Breed a go-to name in precision shooting. If you are looking for a trigger that bridges the gap between a crisp single-stage and a faster follow-up rhythm, the FRT-MR3 is worth your time.

Overview

The FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a drop-in replacement that installs without permanent modifications. It offers three selectable positions: safe, semi-automatic, and forced reset. In forced reset mode, the trigger blade physically moves forward after each shot, requiring you to reset your finger—this creates a natural cadence that many shooters find intuitive. The flat trigger face provides a consistent surface for your finger, reducing pull weight variation across shots. Rare Breed engineered this unit to handle the short-stroke gas system and tight bolt carrier of the HK family, so you do not have to worry about fitment issues.

Features & Specs

• Single-stage design with a smooth, predictable break at approximately 4.5-5.5 pounds, measured from the factory. The flat trigger shoe offers a broad, serrated face for positive grip in wet or gloved conditions.
• Three-position selector: safe, semi-auto, and forced reset mode. The forced reset position uses a mechanical linkage that physically pushes the trigger forward as the bolt cycles, ensuring a deliberate reset every time.
• Machined from billet steel with a nitride finish, rated for high-round-count use. Compatible with standard HK MR223 and MR556 lower receivers without trigger pack modifications.

For the shooter who wants a trigger that works with the HK platform’s unique bolt carrier geometry, the FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 eliminates the guesswork. It is not a binary trigger—it still requires a full reset between shots, but the forced reset mechanism gives you a tactile cue that the trigger is ready to break again. This is especially useful for drills where you need to maintain a steady sight picture while cycling rounds.

Who It Is For

This trigger is designed for experienced shooters who already understand manual of arms and want to reduce split times without sacrificing accuracy. It suits competitive shooters running HK-based rifles in three-gun or tactical matches, as well as enthusiasts who train frequently at the range. The forced reset mode is not a replacement for a binary trigger or a full-auto conversion—it is a training tool that helps you develop a consistent firing rhythm. If you prefer a traditional single-stage pull and do not want to learn a new reset behavior, this may not be the best fit. But if you value repeatable performance and a trigger that tells you exactly when it is ready, the FRT-MR3 delivers.

• Shooters with HK MR223 or MR556 rifles who want a trigger that works specifically with the short-stroke gas piston system.
• Competitors and trainers who run high-volume drills and need a trigger that resets consistently under rapid fire.
• Those who appreciate a flat trigger shoe for a more ergonomic finger placement and a consistent pull angle.

Shipping & FFL

This FRT-MR3 (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a firearm component, not a complete firearm, and ships directly to your doorstep. No FFL transfer is required for this product. However, you must comply with all federal, state, and local laws regarding trigger installation and use. Some jurisdictions restrict forced reset triggers or three-position selectors—check your local regulations before ordering. We ship via UPS Ground or FedEx Home Delivery, and all orders are processed within one business day. If you have questions about compatibility with your specific lower receiver, contact our support team before placing your order.

• No FFL needed for this trigger component. Ships to your residential or business address.
• Check your local laws—some states and municipalities prohibit forced reset triggers. It is your responsibility to ensure compliance.
• Installation is straightforward with standard AR-15 trigger pins, but we recommend having a qualified armorer verify headspace and function if you are not experienced with HK-style lower receivers.