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 precision-engineered upgrade for the roller-delayed blowback platform. Developed by Rare Breed, this trigger system integrates a forced-reset mechanism within a two-stage, three-position selector configuration. Designed exclusively for the HK MP5, MP5K, SP5, and SP5K variants, the FRT-RD3 delivers a repeatable, high-speed cycling action without requiring permanent modification to the host firearm. Each unit is built to exacting specifications, ensuring consistent sear engagement and positive reset characteristics across all three selector positions.

Overview

The FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K redefines the trigger interface for these iconic platforms. By combining a two-stage trigger pull with a forced-reset function, the shooter experiences a distinct wall at the second stage, followed by an aggressive mechanical reset that drives the trigger forward after each shot. This design allows for rapid follow-up shots while maintaining the tactile feedback expected from a two-stage system. The ambidextrous selector accommodates left- and right-handed operators, providing seamless manipulation of the three positions: safe, semi-automatic, and the forced-reset mode. This trigger is a drop-in replacement for factory trigger packs, utilizing existing hammer and sear geometry without requiring aftermarket modifications to the lower receiver.

Features & Specs

• Three-position ambidextrous selector: safe, semi-automatic, and forced-reset mode (FRT) for the HK MP5, MP5K, SP5, and SP5K platforms
• Two-stage trigger pull with a defined first-stage take-up and a crisp second-stage break, followed by a mechanical forced reset that returns the trigger to the ready position after each shot
• Manufactured by Rare Breed; constructed from heat-treated steel components with a corrosion-resistant finish, rated for high-round-count use in demanding environments

Each FRT-RD3 unit is factory-tested to ensure proper engagement with the HK roller-delayed blowback system. The trigger housing is machined to exact tolerances, eliminating play and ensuring consistent alignment with the receiver. The forced-reset mechanism operates independently of the hammer spring, reducing the risk of light primer strikes while maintaining a positive reset. All internal springs are constructed from high-tensile wire, providing reliable function across a wide range of ammunition types and barrel lengths.

Who It’s For

The FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K is intended for experienced shooters who demand precise trigger control combined with rapid shot cycling. This trigger is suitable for competition shooters seeking to maximize split times without sacrificing accuracy, as well as for enthusiasts who appreciate the mechanical sophistication of a forced-reset system. It is also appropriate for collectors and builders who wish to upgrade their HK-pattern firearms with a purpose-built trigger that enhances the shooting experience without altering the core operating system. The ambidextrous layout ensures that left-handed operators maintain full control over the selector positions. This product is not intended for users unfamiliar with forced-reset trigger mechanics or for those who require a standard single-stage trigger.

Shipping & FFL

This product is classified as a firearm component and will ship directly to your provided address. No Federal Firearms License (FFL) transfer is required for this trigger assembly, as it is not a completed firearm receiver. However, you must comply with all applicable federal, state, and local laws regarding the possession and installation of this component. It is your responsibility to verify that the FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K is legal to own and install in your jurisdiction. Some states and municipalities may impose restrictions on forced-reset triggers; please consult legal counsel before purchasing. Rare Breed and this retailer assume no liability for misuse or non-compliance with local regulations. All sales are final once the item has shipped.