Description

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

If you run an HK roller-delayed platform, you know the factory trigger leaves room for improvement. The Rare Breed FRT-RD3 brings forced-reset technology to the MP5, MP5K, SP5, and SP5K with an ambidextrous two-stage, three-position design that gives you genuine control without altering your firearm’s semi-auto classification. This is not a modification to your bolt carrier or buffer system; it is a drop-in trigger group that replaces your stock unit and changes how the trigger resets during the firing cycle.

Overview

The FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K is engineered by Rare Breed to deliver a distinct shooting experience. Unlike conventional triggers, the forced-reset mechanism actively pushes the trigger forward after each shot, allowing the shooter to feel a crisp two-stage pull on the next round. The three-position selector offers safe, semi-auto, and the forced-reset mode. Because it is drop-in, you can install it yourself with basic armorer tools and no permanent modifications to your receiver.

Features & Specs

• Three-position selector: safe, semi-automatic, and forced-reset mode. The forced-reset position uses a mechanical linkage that returns the trigger forward under spring tension, creating a short, predictable reset that requires deliberate finger control.
• Ambidextrous design: left- and right-side selector levers are included, making the FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K accessible to both right- and left-handed shooters without aftermarket parts.
• Two-stage trigger pull: take-up is followed by a defined wall, then a clean break. The reset is tactile and audible, giving you positive confirmation that the trigger is ready for the next shot.

Specifications from Rare Breed list this as a trigger category component built specifically for HK roller-delayed blowback receivers. It is not compatible with push-pin style lowers; it uses the factory trigger housing and hammer assembly locations found on MP5, MP5K, SP5, and SP5K variants.

Who It’s For

This trigger is for experienced shooters who understand forced-reset mechanics and want to increase their speed on target without modifying their firearm’s fire rate. It is ideal for competition shooters running HK-pattern rifles who need a short, consistent reset for fast follow-up shots. It also appeals to collectors and enthusiasts who appreciate Rare Breed’s engineering and want an ambidextrous upgrade that retains the classic HK profile. If you are new to forced-reset triggers, we recommend familiarizing yourself with the manual and practicing at a range before using it in a match or defensive scenario.

• Shooters who run HK MP5, MP5K, SP5, or SP5K variants and want an ambidextrous trigger upgrade.
• Competitors looking for a repeatable two-stage pull with a mechanical reset that does not rely on the bolt carrier.
• Owners who prefer a drop-in solution over trigger job modifications or aftermarket sears.

Shipping & FFL

This FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K ships directly to your door as a firearm component. No Federal Firearms License (FFL) transfer is required because it is not a firearm, frame, or receiver. However, you must ensure the trigger is legal in your state and local jurisdiction. Some states restrict forced-reset triggers or certain drop-in components; it is your responsibility to verify compliance before ordering. Rare Breed does not accept returns on installed triggers, so confirm compatibility with your specific HK model before purchase.

• No FFL needed for shipment; ships to residential addresses within the contiguous United States.
• Check your local laws regarding forced-reset trigger mechanisms before placing an order.
• If you have questions about fitment on your SP5K or MP5 clone, contact our support team with your receiver manufacturer and model.