About this product

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

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K represents a significant advancement in trigger system engineering from Rare Breed. Designed specifically for the HK roller-delayed blowback platform, this forced reset trigger delivers a distinct mechanical cycling experience that resets the trigger forward after each shot without relying on standard trigger return springs. The ambidextrous configuration ensures full functionality for left- and right-handed operators, making the FRT-RD3 a direct drop-in upgrade for your MP5, MP5K, SP5, or SP5K.

Overview

Rare Breed has engineered the FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K to meet the demands of shooters who require precise control over their fire rate. This trigger operates in three selectable positions: safe, semi-automatic, and forced reset mode. In forced reset mode, the trigger mechanically resets forward following each shot, allowing the shooter to maintain consistent trigger manipulation. The two-stage pull provides a defined take-up before the break, offering tactile feedback that aids in accuracy during rapid strings of fire. Built to Rare Breed’s exacting standards, this trigger is machined from heat-treated steel and anodized aluminum components for long-term durability under heavy use.

Features & Specs

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K includes the following specifications and design elements:

• Three-position selector: safe, semi-automatic, and forced reset mode with positive detent engagement
• Ambi safety selector lever compatible with both left- and right-handed shooters
• Two-stage trigger pull: first stage take-up of approximately 1.5 to 2 pounds, second stage break of approximately 3.5 to 4.5 pounds total pull weight
• Drop-in design requiring no permanent modification to your HK MP5, MP5K, SP5, or SP5K lower receiver
• Manufacturer: Rare Breed; Category: Triggers
• Includes all necessary pins, springs, and installation hardware for direct replacement of factory trigger pack

Additional feature highlights:

• Mechanical forced reset action that does not rely on trigger return spring tension
• Heat-treated steel hammer and sear surfaces for extended service life
• Compatible with factory HK trigger housings and aftermarket safety selectors
• Anodized 7075 aluminum trigger shoe with serrated face for positive finger purchase

Who It’s For

This FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is intended for experienced shooters who own an HK-pattern roller-delayed firearm and want to explore forced reset trigger technology. It suits competitive shooters participating in PCC divisions, firearms enthusiasts who train with timed drills, and collectors who appreciate Rare Breed’s engineering approach. This trigger is not recommended for those who lack familiarity with forced reset mechanisms or who prefer a traditional single-stage trigger. The ambidextrous design also benefits left-handed shooters who require a symmetrical interface.

Shipping & FFL

This FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is classified as a firearm component and ships directly to your address. No Federal Firearms License (FFL) transfer is required for this trigger assembly. However, you must comply with all applicable federal, state, and local laws regarding the ownership and installation of forced reset triggers. It is your responsibility to verify that this product is legal to own in your jurisdiction before placing an order. Rare Breed and our retailer assume no liability for non-compliance with local regulations.