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 roller-delayed blowback platforms. Engineered by Rare Breed, this drop-in unit replaces the factory trigger group in standard MP5, MP5K, SP5, and SP5K variants equipped with the SEF (Sicherheits-Einzelfeuer- Feuerstoss) housing pattern. The forced reset mechanism delivers a distinct two-stage pull with a defined wall and crisp break, followed by a positive reset that returns the trigger forward without requiring full finger release. This design allows the shooter to maintain a consistent firing cadence limited only by their ability to manage the reset cycle.

Overview

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is a complete trigger pack assembly that installs directly into your SEF lower receiver. The three-position selector provides safe, semi-automatic, and forced-reset functionality. In the forced-reset position, the trigger mechanism requires the shooter to maintain forward pressure on the trigger after each shot, which then initiates the sear engagement for the next cycle. This system is designed for shooters who want a faster, more controlled shooting experience without modifying the firearm’s original fire control group. The unit is constructed from heat-treated steel and precision-machined components to withstand the recoil impulse of 9mm Parabellum ammunition.

Features & Specs

• Drop-in replacement trigger pack for HK MP5, MP5K, SP5, and SP5K with SEF trigger housing; no permanent modification required to the host firearm
• Three-position selector: safe, semi-automatic, and forced-reset mode with tactile and audible detent feedback at each position
• Two-stage trigger pull: first stage take-up with a distinct wall, followed by a clean break at approximately 4.5-5.5 pounds; forced reset cycle returns the trigger forward automatically after each shot
• Manufactured by Rare Breed, a leading innovator in forced-reset trigger systems; all components are machined from 4140 steel and finished with a MIL-SPEC phosphate coating for corrosion resistance and durability
• Includes all necessary springs, pins, and selector components for direct installation; compatible with factory and aftermarket SEF trigger housings

Who It’s For

This trigger is intended for experienced shooters who own an HK MP5, MP5K, SP5, or SP5K and seek a faster, more repeatable trigger reset without converting their firearm to full-automatic operation. It is suitable for competitive shooters in divisions that permit forced-reset triggers, as well as enthusiasts who want to increase their practical rate of fire while maintaining shot-to-shot accuracy. The two-stage design also benefits shooters who prefer a defined wall before the break, similar to a high-quality match trigger. The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is not recommended for novice users or for firearms used in standard semi-automatic-only competitions where such trigger systems are prohibited.

Shipping & FFL

This item ships directly to your doorstep. No Federal Firearms License (FFL) transfer is required for purchase or delivery. However, you must comply with all applicable federal, state, and local laws regarding the ownership and use of forced-reset triggers. Some jurisdictions may classify this component as a regulated item. It is your responsibility to verify legality in your state, county, and municipality before ordering. Rare Breed and this retailer assume no liability for non-compliance with local regulations. By purchasing this product, you confirm that you are legally eligible to own firearm components and that your use of this trigger will adhere to all applicable laws.