FRT-MR3™ (FLAT) Forced Reset Trigger for the HK MR223 & HK MR556

FRT-MR3™ (Flat) Forced Reset Trigger for HK MR223 & HK MR556

The FRT-MR3™ Forced Reset Trigger is a premium drop-in trigger system engineered for the HK MR223 and HK MR556 platforms, designed to enhance shooting speed, consistency, and overall control. Built and assembled in the USA, this system delivers high-performance functionality while maintaining compliant, semi-automatic operation where applicable.

Performance Upgrade for HK MR223 & HK MR556

The FRT-MR3 trigger is designed to optimize firing efficiency through a mechanical forced reset system. After each shot, the trigger is automatically reset by the action of the bolt carrier group, enabling quicker follow-up shots without requiring manual reset input.

Each round is fired individually, providing controlled operation suitable for training, competition, and range use.

Key Features of the FRT-MR3™ System

3-Position Selector Control

The FRT-MR3 includes a three-position ambidextrous safety selector, offering:

• Safe

• Semi-Automatic

• Forced Reset Mode

This design supports both left- and right-handed shooters, delivering flexible control in different shooting scenarios.

Drop-In Installation Design

The system is engineered for straightforward installation into MIL-SPEC lower receivers, featuring:

• Drop-in compatibility

• Anti-walk trigger pins for added stability

• Ambidextrous safety integration

Heavy-Duty Construction

Built for durability under repeated use, the FRT-MR3 is manufactured using high-strength materials such as:

• 7075 anodized aluminum

• Heat-treated 4140 steel

• S7 tool steel components

This ensures long-term reliability and resistance to wear under demanding conditions.

Platform Compatibility

The FRT-MR3 is specifically designed for:

• HK MR223

• HK MR556

It operates with factory semi-automatic bolt carrier groups for proper function. It is not compatible with HK416 or BRN4 full-auto BCG configurations.

Faster Follow-Up Shots with Mechanical Reset

The forced reset mechanism allows the trigger to reset automatically as the bolt carrier cycles. This reduces reset time between shots and improves shot cadence while maintaining controlled, individual firing per trigger pull.

The result is a smoother, more responsive shooting experience without requiring advanced trigger manipulation.

Why Choose the FRT-MR3™

The FRT-MR3 is ideal for shooters looking to enhance performance on HK MR platforms. It offers:

• Increased firing speed through forced reset mechanics

• Stable drop-in installation with anti-rotation support

• Ambidextrous usability

• Platform-specific engineering for HK MR223 and MR556

Whether used for training, competition, or recreational shooting, it provides a refined balance of speed and control.