About this product

FRT-RD3™ (SEF) Two-Stage · 3-Position · SEF Housing · HK MP5 / MP5K / SP5 / SP5K HK MP5 HK MP5K HK SP5 HK SP5K The FRT-RD3™ (SEF) delivers Rare Breed Triggers’ patented forced reset technology inside the iconic SEF (Safe/Semi/Full) housing — purpose-built for the HK MP5, MP5K, SP5, and SP5K . Three selectable positions — Safe, Two-Stage, and Forced Reset — in a classic Nationwide shipping. Order from anywhere in the US.

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

If you run a HK roller-delayed platform, you already know the trigger is everything. The factory pack is reliable, but it leaves speed on the table. That is where the FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K comes into play. Rare Breed engineered this drop-in unit to work with standard SEF trigger housings, giving you three distinct positions: safe, semi-auto, and a forced-reset mode that brings the trigger face forward faster than your finger can naturally follow. The result is a crisp, repeatable pull that lets you stay on target without fighting the reset.

Overview

This is not a gimmick. The FRT-RD3™ (SEF) uses a two-stage mechanical design. In forced-reset mode, the trigger physically pushes your finger forward after each shot, so you are ready to fire again almost instantly. It is a legal, semi-automatic trigger system that changes how you interact with the gun. Because it fits SEF housings, you can drop it into most MP5, MP5K, SP5, and SP5K variants without permanent modification. Rare Breed built this unit from hardened steel and tested it to handle the cyclic rate of a suppressed roller gun. It is the kind of upgrade that makes a range trip feel completely different.

Features & Specs

• Three-position selector (Safe, Semi, Forced Reset) compatible with standard SEF trigger packs and housings.
• Two-stage forced reset mechanism that re-engages the sear without relying on a traditional spring return.
• Machined from billet steel with a phosphate finish for corrosion resistance and consistent performance under heat.
• Direct drop-in fit for HK MP5, MP5K, SP5, and SP5K models that accept SEF pack geometry.
• Includes Rare Breed’s proprietary hammer and disconnector geometry to prevent slam-fires and ensure positive sear engagement.

Every part in the FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is made in the USA. The tolerances are tight enough that you will notice the difference the first time you pull the trigger. No polishing needed; it breaks clean out of the box.

Who It’s For

This trigger is for the shooter who has already mastered the basics and wants to push splits without missing. If you run competition drills, night shoots, or just enjoy fast, accurate follow-up shots, the forced-reset mode gives you an edge. It is also for the collector who wants a period-correct SEF housing with modern internals. If you own a SP5 and have been looking for a way to get a faster cadence without switching to an aftermarket lower, this is your answer. The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K works equally well in suppressed and unsuppressed configurations, so it fits range toys and home defense setups alike.

Shipping & FFL

This item ships directly to your doorstep. No FFL transfer is required because this is a firearm component, not a receiver or complete firearm. However, you must ensure that the trigger is installed in compliance with all applicable federal, state, and local laws. Some states and municipalities restrict the possession or use of forced-reset triggers. It is your responsibility to verify legality before purchase. Rare Breed triggers are designed for semi-automatic use only, and any modification to convert this unit to full-auto function is illegal. If you have questions about your jurisdiction, check with a local attorney or your state attorney general’s office before ordering.