Description

Frt-Rd3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger For The Hk Mp5, Mp5K, SP5 & SP5K

The Rare Breed FRT-RD3 (AMBI) represents a significant engineering evolution in forced reset trigger technology specifically tailored for the HK roller-delayed platform. This two-stage, three-position trigger system is precision-machined for the MP5, MP5K, SP5, and SP5K variants, providing an ambidextrous solution that maintains the classic HK manual of arms while introducing a forced-reset cycling mechanism. Designed for shooters who demand a distinct mechanical trigger feel without sacrificing reliability, the FRT-RD3 integrates seamlessly into the host firearm’s lower receiver with no permanent modifications required.

Overview

The FRT-RD3 (AMBI) is a drop-in trigger group that replaces the factory trigger pack in HK-pattern roller-delayed blowback firearms. It operates with a two-stage pull and a three-position selector: Safe, Semi-Automatic, and a forced-reset mode. In the forced-reset position, the trigger mechanism utilizes the firearm’s recoil impulse to physically reset the trigger shoe forward, allowing for rapid follow-up shots while maintaining positive sear engagement. This ambidextrous variant ensures left-handed and right-handed operators experience identical control ergonomics. The frt-rd3 (ambi) two-stage (3-position) forced reset trigger for the hk mp5, mp5k, sp5 & sp5k is built from heat-treated steel components with a corrosion-resistant finish, ensuring longevity under sustained use.

Features & Specs

• Three-position selector with Safe, Semi-Automatic, and Forced-Reset operating modes; ambidextrous safety selector lever included for left and right hand operation.
• Two-stage trigger pull with a distinct take-up wall before the break; forced-reset mode utilizes a mechanical spring-loaded actuator that re-engages the trigger shoe after each shot cycle.
• Manufacturer: Rare Breed; Category: Triggers; compatible with HK MP5, MP5K, SP5, and SP5K models using standard push-pin lower receiver configurations.

The trigger housing is constructed from billet 7075-T6 aluminum with a type III hard coat anodized finish. Internal components are CNC-machined from S7 tool steel and include a hardened disconnect sear. The entire assembly weighs approximately 4.2 ounces and installs without fitting, using the factory trigger housing pins. The frt-rd3 (ambi) two-stage (3-position) forced reset trigger for the hk mp5, mp5k, sp5 & sp5k requires no additional springs or aftermarket parts for proper function.

• Pull weight measured at 4.5 to 5.5 pounds in semi-automatic mode; forced-reset mode exhibits a consistent 4.0 to 5.0 pound pull weight with a mechanical reset distance of 0.080 inches.
• Operating temperature range: -20 degrees Fahrenheit to 160 degrees Fahrenheit; drop-safe design with inertial firing pin block compatibility verified.
• Includes ambidextrous selector detent springs, replacement trigger housing pins, and a detailed installation guide with torque specifications.

Who It’s For

This trigger system is engineered for experienced shooters who own HK SP5, SP5K, MP5, or MP5K platforms and seek a mechanically distinct trigger interface. It is suitable for competitive shooters participating in PCC divisions where forced-reset triggers are permitted, as well as collectors who want a drop-in upgrade that preserves the original firearm’s manual of arms. The ambidextrous design accommodates both right-handed and left-handed operators without requiring additional adapter plates. The frt-rd3 (ambi) two-stage (3-position) forced reset trigger for the hk mp5, mp5k, sp5 & sp5k is not recommended for users unfamiliar with forced-reset trigger mechanics or those who require a conventional single-stage trigger for precision slow-fire applications.

• Owners of HK SP5, SP5K, MP5, and MP5K variants who want a trigger upgrade with a mechanical forced-reset action.
• Shooters who prefer a two-stage trigger with a defined wall and a consistent break point in semi-automatic mode.
• Users who require ambidextrous controls and a drop-in installation process without permanent modifications to the lower receiver.

Shipping & FFL

This product is classified as a firearm trigger group and is not a firearm receiver or frame. It may be shipped directly to your residential or business address without requiring transfer through a Federal Firearms License (FFL) dealer. However, you must comply with all federal, state, and local laws regarding the purchase and installation of firearm components. Some states, counties, or municipalities may impose restrictions on forced-reset triggers or trigger mechanisms. It is your responsibility to verify legality before purchasing. Rare Breed and this retailer assume no liability for non-compliance with applicable laws.