FRT-RD3™ (AMBI)
Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K

Take your HK roller-delayed pattern firearm to the next level with the official Rare Breed Triggers FRT-RD3™ (AMBI). This drop-in, duty-grade 3-position Forced Reset Trigger (Safe/Semi/FRT®) is 100% manufactured and assembled in the USA. The FRT-RD3™ (AMBI) includes a 3-position safety selectors for HK AMBI grip frames.

Performance on the Range
Enhance your shooting experience with the FRT-RD3™ (AMBI) Forced Reset Trigger. Designed to accelerate follow-up shots while remaining within legal parameters, the innovative Forced Reset system resets the trigger after each shot, enabling faster, more consistent firing. Each trigger pull fires one round, ensuring full legal compliance while delivering improved speed and performance. Perfect for competitive shooting, tactical training, or maximizing your HK roller-delayed firearm’s potential.

Innovative Design and Features

• 3-Position Functionality: The FRT-RD3™ (AMBI) features Safe, Semi, and Forced Reset modes, controlled via a 3-position, HK AMBI style safety selector.
• Effortless Installation: The FRT-RD3™ (AMBI) includes an AMBI safety selector designed for easy installation in an HK AMBI type grip frame.

Durable Construction for Long-Lasting Performance
Crafted from high-quality materials, including 7075 anodized aluminum and heat-treated 4140, the FRT-RD3™ (AMBI) is built to endure heavy use. This robust construction ensures reliability and longevity, allowing you to push your roller locked firearm to its limits with confidence.

Compatibility with the HK MP5/SP5 Platform
The FRT-RD3™ (AMBI) is specifically engineered to operate with the factory semi-automatic bolt carrier used in the HK MP5, MP5K, SP5, and SP5K roller-delayed pattern firearms. For that reason, the FRT-RD3™ (AMBI) is compatible with models containing factory full-auto carrier denial blocks in the receiver with no modifications needed to the firearm. The FRT-RD3™ (AMBI) provides simple plug and play installation. Please note: The FRT-RD3™ (AMBI) is also compatible with all full-auto bolt carrier groups but one is not required.

Compatibility with the HK MP5/SP5 AMBI Grip Frame
The HK AMBI grip frame is identified by the modern Pictogram markings (often called the “Navy” style). Instead of letters, it uses bullet icons: a white slashed bullet for Safe, a single red bullet for Semi, and (if applicable) multiple red bullets in a box for Burst or Auto. This configuration uses levers on both sides of the frame. The indicator mark is located on the forward-facing radius of the selector axle rather than a pointing tail.

Unmatched Speed and Control
The FRT-RD3™ (AMBI) is ideal for shooters seeking speed and precision. The FRT-RD3™ (AMBI) was designed from the ground up as a specific HK, roller-delayed trigger. Specific geometry ensures correct, safe timing and function for the roller-delayed platform with no possibility of firearm damage. The FRT-RD3™ (AMBI) provides a clean, crisp 2-stage trigger pull. By mechanically resetting the trigger after each shot, then locking the trigger from being pulled until the BCG returns to battery, this system allows for faster follow-up shots without needing advanced techniques. The forced reset mechanism ensures the trigger returns to the non-firing position after each round, requiring the shooter to pull the trigger again, offering full control over each shot.

Why Choose the FRT-RD3™ (AMBI) Forced Reset Trigger?
If you’re looking to boost your HK roller-delayed firearm’s performance, the FRT-RD3™ (AMBI) Forced Reset Trigger is the ultimate upgrade. With its rapid-fire capability, versatile fitment, and seamless compatibility with the HK MP5/SP5 and similar roller-delayed firearm platforms, this trigger provides a superior shooting experience for competition, tactical use, or range drills. Unlock the full potential of your HK MP5, MP5K, SP5, or SP5K with the FRT-RD3™ (AMBI).

Manufactured and Assembled in the USA

Patent Notice: This product is covered by one or more U.S. Patents, including U.S. Patent Nos. 10,514,223; 11,724,003; 12,036,336; and 12,274,807. Additional patents may be pending. Unauthorized manufacture, use, sale, or importation of this product or its covered features may constitute patent infringement.

As always, Rare Breed Triggers encourages the safe and responsible use of our products.