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

The FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K represents a significant advancement in trigger technology for the roller-delayed platform. Engineered by Rare Breed, this drop-in assembly delivers a two-stage, three-position forced reset trigger system that allows the shooter to select between standard semi-automatic fire and a forced-reset cycling mode. Designed specifically for HK-pattern firearms chambered in 9mm, the FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K provides a distinct mechanical advantage without compromising the reliability inherent to the platform.

Overview

The FRT-RD3 (SEF) trigger is a complete replacement unit that installs directly into your MP5, MP5K, SP5, or SP5K lower receiver. Unlike traditional triggers, the forced reset mechanism physically returns the trigger forward after each shot, enabling rapid follow-up shots with a consistent two-stage pull. The three-position selector allows the operator to choose safe, semi-automatic, and forced-reset modes. This unit is built to mil-spec dimensions and uses SEF (single-single) trigger housing geometry, making it compatible with standard HK push-pin installations. Every FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is precision-machined from heat-treated steel and aluminum components to ensure longevity under sustained use.

Features & Specs

• Three-position selector: safe, semi-automatic, and forced reset mode with tactile detent feedback
• Two-stage trigger pull: first stage take-up followed by a crisp second stage break
• Drop-in design: no permanent modification to your HK lower receiver required; standard push-pin installation

• Manufacturer: Rare Breed
• Category: Triggers
• Platform compatibility: HK MP5, MP5K, SP5, SP5K (9mm)
• Housing type: SEF (single-single) configuration
• Materials: heat-treated steel hammer and sear, aluminum trigger shoe and selector
• Finish: nitride carrier with hardcoat anodized selector

• Forced reset function requires deliberate trigger control to achieve optimal cycle rate
• Two-stage pull weight approximately 5-6 pounds in semi-automatic mode
• Forced reset mode uses mechanical trigger return via bolt carrier movement
• Includes complete trigger pack, selector lever, and all necessary springs and pins
• Tested for function with factory 115gr, 124gr, and 147gr 9mm ammunition

Who It’s For

The FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is designed for shooters who demand enhanced trigger performance from their roller-delayed firearm. This product suits experienced firearms owners who understand manual of arms for forced reset triggers and want to improve their split times without converting to a full-automatic configuration. Competitive shooters, training professionals, and collectors who own HK-pattern 9mm carbines or pistols will find this trigger useful for drills requiring rapid target transitions and controlled pairs. It is not recommended for shooters unfamiliar with forced reset trigger mechanics or those who do not regularly maintain their firearms. This component requires the user to read and understand all manufacturer instructions before installation.

Shipping & FFL

This item ships directly to your residential or business address within the United States. No Federal Firearms License (FFL) transfer is required for this product as it is a firearm component, not a firearm frame or receiver. This FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is classified as a trigger assembly and does not contain a serialized part. However, you are responsible for ensuring compliance with all applicable federal, state, and local laws regarding possession and installation of forced reset trigger systems. Rare Breed recommends checking your local statutes before ordering. Standard shipping rates apply, and we ship within one business day of order processing.