Description

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

If you run an HK roller-delayed platform, you already know the trigger is the soul of the gun. The FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K changes the way you interact with your favorite 9mm carbine. Designed by Rare Breed, this drop-in forced reset trigger gives you a crisp two-stage pull with a third position that resets the trigger forward under recoil. It retains the classic SEF (Sicher/Feuer) selector markings for a period-correct look on your SP5 or MP5K.

We have tested this unit extensively on both the full-size MP5 and the compact SP5K. The forced reset action means the trigger blade moves forward automatically after each shot, letting you ride the reset without lifting your finger. It is not a binary trigger and it is not full-auto, but it delivers a fast, controlled cycle that feels intuitive once you run a few mags through it. For anyone who wants a reliable, shootable upgrade for their HK roller-lock, this is the trigger you have been waiting for.

Overview

The Rare Breed FRT-RD3 is a three-position, two-stage forced reset trigger purpose-built for the HK MP5, MP5K, SP5, and SP5K. Unlike standard drop-in triggers for the AR platform, this unit is engineered specifically for the roller-delayed blowback system. It uses a single-stage forced reset mechanism that mimics a two-stage feel due to the take-up and wall before break. The third position on the selector (rearward) enables the forced reset function. In the semi-auto (fire) position, it works as a standard two-stage trigger. This gives you flexibility at the range without swapping parts.

Features & Specs

• Three-position SEF selector (Safe, Semi, Forced Reset) with authentic HK-style markings
• Two-stage feel with a distinct wall and crisp break; forced reset cycle returns the trigger forward under spring tension
• Drop-in design for HK MP5, MP5K, SP5, and SP5K platforms; no permanent modification required
• Constructed from heat-treated steel and hardened aluminum components with nickel-Teflon coated internal surfaces
• Manufacturer: Rare Breed Triggers | Category: Triggers | Finish: Matte black

The FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K ships with a complete housing, trigger shoe, hammer, springs, and selector levers. Installation takes about 15 minutes with basic tools. We recommend using a punch set and a bench block. The trigger housing fits standard HK push-pin lowers without modification. For SP5 owners, no extra spacers are needed.

Who It Is For

This trigger is for experienced HK owners who want faster follow-up shots without sacrificing trigger control. It suits competitive shooters in PCC divisions, three-gun competitors running roller-delayed guns, and enthusiasts who appreciate mechanical precision. If you own an SP5K and find the stock trigger mushy or slow, this upgrade gives you a predictable reset point that keeps your finger on the trigger face. It is also a solid choice for collectors who want to keep the SEF aesthetic while gaining modern performance. We recommend it for shooters who understand manual safety discipline and have experience with forced reset triggers.

Shipping & FFL

This trigger ships directly to your doorstep. No FFL transfer is required because it is a trigger assembly, not a firearm. We ship via UPS Ground within the continental United States. Please check your local and state laws regarding forced reset triggers before ordering. Some states have specific restrictions on trigger mechanisms that alter the firing cycle. You are responsible for compliance with all applicable laws. If you have questions about your state, contact us before placing your order.

• No FFL transfer needed; ships to your home address
• Standard UPS Ground shipping; expedited options available at checkout
• Customer assumes responsibility for verifying local legality of forced reset trigger devices