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 distinct upgrade path for rollers delayed blowback platforms. Manufactured by Rare Breed, this trigger system installs directly into the single-elastic-fire (SEF) lower receiver housing of your HK or clone firearm. It delivers a forced-reset mechanism that returns the trigger forward under spring tension immediately after the shot breaks, enabling rapid follow-up shots without modification to the host firearm’s bolt carrier or recoil assembly.

Overview

This FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is designed for shooters who require consistent, repeatable trigger manipulation under high-round-count conditions. The three-position selector provides safe, semi-automatic, and forced-reset functionality. In the forced-reset position, the shooter must release the trigger fully between shots to reset the sear, which is mechanically assisted by the trigger’s internal spring system. This design does not alter the semi-automatic classification of the firearm and is compatible with standard MP5-pattern parts and magazines.

Features & Specs

• Three-position selector: safe, semi-automatic, and forced-reset (FR) mode. The FR position uses a two-stage trigger pull with a defined wall and a mechanical forced-reset function that returns the trigger forward after each discharge.
• Direct drop-in fit for SEF lower receivers on HK MP5, MP5K, SP5, and SP5K models. No permanent modifications, filing, or after-market trigger housings required for installation.
• Manufacturer: Rare Breed. Category: Triggers. Constructed from heat-treated steel and hardened aluminum components with a Mil-Spec phosphate finish for corrosion resistance and consistent trigger pull weight.

Who It’s For

This trigger is intended for experienced shooters who operate HK-pattern firearms in competitive, training, or recreational settings. The FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is best suited for individuals who understand forced-reset mechanics and can manage the specific manual of arms required for reliable operation. It is not designed for defensive carry, law enforcement duty, or shooters unfamiliar with trigger-reset discipline. Users should verify compatibility with their specific lower receiver configuration prior to purchase, as minor variations exist between HK and clone-manufactured housings.

• Designed for roller-delayed blowback platforms: HK MP5, MP5K, SP5, and SP5K with SEF trigger packs. Not compatible with Navy-style, ambidextrous, or push-pin lower receivers without additional adapter components.
• Recommended for shooters who train regularly and can demonstrate safe trigger manipulation at elevated round counts. The forced-reset function requires deliberate finger release between shots to prevent out-of-battery discharges.
• Best deployed in controlled range environments where rapid, aimed fire is the objective. Not intended for three-gun competition stages that mandate specific trigger types.

Shipping & FFL

This item ships directly to your doorstep. No Federal Firearms License (FFL) transfer is required because the FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is classified as a firearm component and not a firearm frame or receiver. However, end users must comply with all applicable federal, state, and local laws regarding trigger installation and firearm configuration. Some states and municipalities impose restrictions on forced-reset triggers or binary-style mechanisms. You are solely responsible for verifying that possession and use of this product is legal in your jurisdiction before placing an order.