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

Overview

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is the latest advancement in forced reset trigger technology from Rare Breed. Engineered specifically for the HK roller-delayed blowback platform, this drop-in trigger assembly replaces the factory SEF (Sicher, Einzelfeuer, Feuerstoss) pack and delivers a controlled, two-stage pull with a positive reset that forces the trigger forward after each shot. Designed for the MP5, MP5K, SP5, and SP5K, the FRT-RD3™ maintains compliance with ATF regulations while providing the shooter with a rapid, repeatable firing cycle. Each unit is machined from heat-treated steel and precision-fitted to eliminate slop and ensure consistent performance under sustained fire. The three-position selector allows safe, semi-automatic, and forced-reset operation, giving the end user full control over rate of fire without compromising reliability.

Features & Specs

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K integrates Rare Breed’s proven forced-reset mechanism into a compact, drop-in package. Key engineering highlights include a two-stage sear engagement that reduces overtravel and a hardened steel hammer that withstands thousands of cycles. The trigger shoe features a flat face for consistent finger placement, and the entire assembly is coated with a corrosion-resistant finish.

• Two-stage pull with forced-reset functionality: first stage take-up followed by a crisp break, with a mechanical reset that returns the trigger forward automatically after each shot.
• Three-position selector: safe (S), semi-automatic (E), and forced-reset (F) modes, clearly marked and tactile.
• Drop-in design: no permanent modification to the trigger housing required; installs directly into MP5, MP5K, SP5, and SP5K lower receivers with SEF cutouts.

Who It’s For

This trigger system is intended for experienced shooters who own an HK MP5, MP5K, SP5, or SP5K and demand a higher rate of fire without converting to full-auto. Competitive shooters in PCC divisions will benefit from the forced-reset cycle that minimizes trigger reset travel, allowing faster follow-up shots. Law enforcement and security professionals who train with the MP5 platform can use the FRT-RD3™ to enhance manipulation drills while staying within legal parameters. Collectors and enthusiasts who appreciate precision engineering will value the all-steel construction and the ability to switch between standard semi-automatic and forced-reset modes. The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is not a training aid for automatic fire; it is a purpose-built trigger upgrade for those who shoot frequently and want to maximize their platform’s potential.

• Owners of HK MP5, MP5K, SP5, and SP5K with SEF trigger housings.
• Shooters who want a rapid, repeatable firing cycle without full-auto modifications.
• Competitors and trainers who need a durable, drop-in trigger with two-stage consistency.

Shipping & FFL

This FRT-RD3™ trigger is classified as a firearm component and ships directly to your door without an FFL transfer. No background check is required for purchase, but you must be 18 years or older and comply with all local, state, and federal laws. Rare Breed triggers are legal in most states; however, certain jurisdictions—including but not limited to California, New York, New Jersey, Connecticut, Massachusetts, Maryland, Washington D.C., and Washington State—may restrict the sale or possession of forced-reset triggers. It is your responsibility to verify that this product is legal to own in your city, county, and state before ordering. We ship via UPS Ground with signature required. All sales are final. By purchasing the FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K, you acknowledge that you are not a prohibited person and that you will use this product in compliance with all applicable laws.

• No FFL required for shipment to most states.
• Buyer must verify local legality before purchase.
• Signature required upon delivery; no returns on installed triggers.