Description

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 is a precision-engineered drop-in upgrade designed exclusively for the HK MP5, MP5K, SP5, and SP5K platforms. Manufactured by Rare Breed, this trigger system delivers a distinct two-stage pull with a forced-reset function that re-engages the sear immediately upon forward bolt travel. It offers three selectable positions: Safe, Semi-Automatic, and Forced Reset. This is not a binary trigger or a full-auto device. It is a semi-automatic trigger that uses the bolt’s forward motion to reset the trigger shoe, enabling a rapid, consistent pull cycle under direct shooter control.

Overview

The FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is a mechanical upgrade that replaces the factory trigger pack with minimal modification. It retains standard safety selector markings (S-E-F) and operates within a three-position selector layout. The first stage provides take-up with a defined wall, while the second stage breaks cleanly. Upon firing, the bolt carrier forces the trigger forward, resetting it for the next shot. This system is designed for shooters who want a faster reset without converting to a non-compliant configuration. Rare Breed’s manufacturing standards ensure dimensional accuracy and consistent performance across all compatible host platforms.

Features & Specs

This trigger system is built around the forced-reset principle, where the bolt physically resets the trigger during the cycle of operation. The FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K includes the following specifications and design details:

• Manufacturer: Rare Breed. Category: Triggers. Drop-in design for HK MP5, MP5K, SP5, and SP5K variants. No permanent modification to the host firearm required.
• Three-position selector: Safe, Semi-Automatic, and Forced Reset. Marked S-E-F for compatibility with standard HK lower receivers. Forced Reset position uses a two-stage pull with mechanical reset.
• Two-stage trigger pull with defined first-stage take-up and a crisp second-stage break. Reset is mechanically driven by bolt carrier movement, not by spring tension alone.

The trigger shoe geometry is optimized for gloved or ungloved use. Internal components are heat-treated steel with a corrosion-resistant finish. The FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is tested for function with both factory and aftermarket bolts. It is not compatible with push-pin style trigger housings or non-SEF selector configurations without adapter plates.

Who It’s For

This trigger is intended for experienced shooters who own an HK MP5, MP5K, SP5, or SP5K and want a repeatable, fast-resetting trigger system without modifying the firearm’s semi-automatic classification. It is suitable for competition shooters who need consistent reset timing, as well as enthusiasts who appreciate mechanical innovation in trigger design. The FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is not a training device for automatic fire. It requires deliberate trigger control to operate effectively. Users should be familiar with the forced-reset mechanism and understand that it functions differently from a standard single-stage or two-stage trigger. This product is not for novice shooters or those unwilling to learn the manual of arms required for safe operation.

Shipping & FFL

This trigger system is classified as a firearm component, not a firearm receiver. It ships directly to your doorstep. No Federal Firearms License (FFL) transfer is required for purchase. However, you must comply with all applicable federal, state, and local laws regarding trigger ownership and installation. Some states and municipalities restrict forced-reset triggers or similar devices. It is your responsibility to verify legality in your jurisdiction before ordering. Rare Breed and this retailer assume no liability for non-compliance with local regulations. Installation should be performed by a qualified gunsmith if you are not familiar with HK trigger pack disassembly and reassembly. Retain all original factory parts for future use.