Description

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

If you own an HK roller-delayed platform, you know the trigger is the soul of the gun. The factory trigger on the MP5, MP5K, SP5, or SP5K works, but it leaves you wanting more speed and control. That is where the FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger steps in. Designed by Rare Breed, this drop-in trigger system transforms your roller-delayed firearm into a high-performance shooting tool. It gives you three distinct selector positions, a crisp two-stage feel, and the patented forced-reset technology that lets you rip through rounds with remarkable speed. This is not a gimmick; it is a purpose-built upgrade for shooters who demand more from their HK pattern rifles and pistols.

Overview

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is a complete drop-in trigger assembly that replaces your existing SEF trigger pack. It uses Rare Breed’s proven forced-reset mechanism, which physically pushes the trigger forward after each shot. This allows you to focus on a fast, consistent pull without fighting a slow reset. The two-stage design gives you a distinct take-up wall before the break, so you maintain precision when you need it. With three positions—safe, semi-automatic, and a forced-reset mode—you get versatility without compromising safety. Installation requires no permanent modification to your firearm, and it uses the standard HK SEF trigger housing.

Features & Specs

• Three-position selector: safe, semi-automatic, and forced-reset mode. The forced-reset position physically returns the trigger forward after each shot for rapid follow-ups.
• Two-stage trigger pull with a clean, predictable break. The first stage takes up slack, and the second stage delivers a crisp release without creep.
• Drop-in design for HK MP5, MP5K, SP5, and SP5K models with standard SEF trigger housings. No fitting or gunsmithing required.

The FRT-RD3™ is built around the SEF trigger pack geometry, meaning it directly replaces your existing trigger group. The forced-reset mechanism is mechanical and does not rely on springs or batteries. Rare Breed uses heat-treated steel components and a durable phosphate finish to withstand heavy use. This trigger is designed for the roller-delayed blowback system, so it functions reliably across different ammunition types and barrel lengths. The two-stage pull weight is adjustable via the factory spring set, letting you fine-tune the break to your preference.

Who It’s For

This trigger is for the HK enthusiast who wants to push their MP5 or SP5 past factory limitations. If you compete in PCC matches, run tactical drills, or simply enjoy fast, accurate shooting, the FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K gives you a competitive edge. It is also ideal for collectors who want a period-correct SEF trigger with modern performance. Law enforcement and security professionals will appreciate the predictable reset under stress. And if you are a DIY builder assembling an MP5 clone, this trigger drops right into your SEF housing without headaches. Whether you shoot suppressed or unsuppressed, with a brace or a stock, the FRT-RD3™ performs consistently.

Shipping & FFL

This trigger is a firearm component and does not require transfer through a Federal Firearms License (FFL) dealer. It ships directly to your doorstep within the United States. However, you must ensure that installation complies with all local, state, and federal laws. We recommend checking your state’s regulations regarding forced-reset triggers before placing your order. Standard shipping rates apply, and we typically process orders within one to two business days. If you have questions about compatibility or legal status, contact our customer service team for guidance.