FRT-MR3™

Single-Stage 3-Position Forced Reset Trigger for HK MR223 & HK MR556 Platforms

Upgrade your HK MR223 or HK MR556 with the official Rare Breed Triggers FRT-MR3™ — a premium drop-in forced reset trigger engineered for speed, precision, and enhanced shooting performance. Manufactured and assembled in the USA, the FRT-MR3™ delivers advanced trigger technology, rugged construction, and reliable operation specifically designed for HK piston-driven platforms.

The FRT-MR3™ features a versatile 3-position selector system with Safe, Semi-Automatic, and Forced Reset Trigger (FRT®) modes. Each trigger includes a 3-position ambidextrous safety selector and anti-walk pins, providing a secure and streamlined installation.

Advanced Performance for HK Platforms

The FRT-MR3™ is designed to enhance the shooting experience by improving trigger reset speed and consistency. Its innovative forced reset system mechanically resets the trigger after each shot, allowing faster follow-up shots while maintaining shooter control.

Each trigger pull is designed to fire one round, providing a controlled and predictable shooting experience for competitive shooting, training, and range applications.

Key Features

3-Position Ambidextrous Selector

The FRT-MR3™ provides quick and intuitive mode selection with a 3-position ambidextrous safety selector designed for both left- and right-handed shooters.

Available modes include:

• Safe Mode
• Semi-Automatic Mode
• Forced Reset Trigger (FRT®) Mode

Drop-In Installation & Secure Fit

Designed specifically for HK MR223 and HK MR556 platforms, the FRT-MR3™ offers a straightforward installation process and includes anti-walk trigger pins to help maintain secure alignment during extended use.

The ambidextrous selector integrates cleanly with compatible HK platforms for a reliable factory-style fit and function.

Single-Stage Trigger Performance

The FRT-MR3™ provides a consistent single-stage trigger feel designed for speed, control, and repeatable performance.

Semi-Automatic Mode:

• Smooth single-stage trigger operation
• Consistent trigger feel throughout travel
• Designed for precision and fast follow-up shots

Forced Reset Trigger (FRT®) Mode:

• Enhanced reset speed
• Consistent trigger operation
• Engineered for improved shooting cadence while maintaining individual shot control

Built for Durability & Reliability

The FRT-MR3™ is manufactured using premium materials selected for strength and long-term performance:

• 7075 anodized aluminum
• Heat-treated 4140 steel
• Heat-treated S7 steel components

This rugged construction ensures dependable performance in demanding environments.

HK MR223 & HK MR556 Compatibility

The FRT-MR3™ is specifically engineered for use with the HK MR223 and HK MR556 platforms.

It is designed to operate with the factory semi-automatic bolt carrier group (BCG) supplied with these systems.

For optimal performance and reliability:

• Retain the factory buffer system
• Retain the factory recoil spring
• Use the original factory semi-auto BCG

Compatibility Note:
The FRT-MR3™ is not compatible with HK416 or BRN4 full-auto bolt carrier groups.

Speed, Precision & Control

The FRT-MR3™ is designed for shooters who demand improved performance from their HK MR223 and HK MR556 platforms. By mechanically resetting the trigger after each shot and preventing trigger activation until the bolt carrier group returns to battery, the system provides a faster and more consistent shooting experience.

The forced reset mechanism returns the trigger to the ready position after each round, requiring a separate trigger pull for every shot and maintaining full shooter control.

Why Choose the FRT-MR3™?

For shooters looking to maximize the performance of their HK MR223 or HK MR556, the FRT-MR3™ delivers a premium trigger upgrade with advanced forced reset technology, durable materials, and platform-specific engineering.

Experience enhanced speed, precision, and control with the FRT-MR3™ — engineered for HK performance.

Manufactured & Assembled in the USA