Description

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

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K represents a significant advancement in trigger system engineering for roller-delayed blowback platforms. Manufactured by Rare Breed, this drop-in assembly delivers a patented forced-reset mechanism that combines binary-style functionality with a definitive two-stage break. Designed specifically for HK-pattern firearms, this trigger provides shooters with a reliable, ambidextrous control interface that maintains factory safety standards while enabling faster follow-up shots through mechanical forced-reset operation.

Overview

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is the latest evolution in Rare Breed’s forced-reset trigger lineup. This unit features a three-position selector: Safe, Semi-Automatic, and Forced-Reset mode. In forced-reset operation, the trigger mechanism mechanically resets the trigger forward immediately after each shot, allowing the shooter to focus on a consistent trigger pull rather than waiting for a manual reset. The ambidextrous safety selector accommodates both left- and right-handed operators without modification to the lower receiver. Each unit is precision-machined from billet steel and aluminum components to withstand the high cyclic rates inherent to the MP5 platform.

Features & Specs

• Three-position selector: Safe, Semi-Automatic, and Forced-Reset mode; ambidextrous safety lever included for left/right operation
• Two-stage trigger pull: first stage take-up followed by a crisp second stage break; forced-reset function activates after each shot cycle
• Drop-in design: no permanent modifications required to HK MP5, MP5K, SP5, or SP5K lower receivers; includes all necessary pins and springs

Additional specifications include a nickel-Teflon coated trigger shoe for reduced friction, a CNC-machined 4140 steel hammer, and a Mil-Spec diameter trigger pin for compatibility with standard HK trigger housings. The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K operates within the same dimensional tolerances as factory HK components and does not alter the firearm’s original fire control group geometry.

• Manufacturer: Rare Breed
• Category: Triggers
• Compatibility: HK MP5, MP5K, SP5, SP5K (9mm) with standard trigger housings; not compatible with SEF or Navy trigger packs without modification
• Weight: approximately 4.2 ounces; pull weight: 4.5-5.5 pounds in semi-automatic mode

Who It’s For

This trigger system is intended for experienced shooters who own HK MP5, MP5K, SP5, or SP5K firearms and seek a mechanical advantage in rapid-fire scenarios without converting to full-automatic operation. Competitive shooters, defensive firearms instructors, and enthusiasts who train for speed and accuracy will benefit from the forced-reset design, which reduces the time required to reset the trigger between shots. The ambidextrous controls make this a viable option for left-handed shooters who often struggle with traditional MP5 selector setups. This product is not recommended for new shooters or those unfamiliar with forced-reset trigger mechanics; proper training and range qualification are advised before operational use.

• HK MP5 and SP5 owners desiring ambidextrous forced-reset capability
• Shooters who train for speed and recoil management with roller-delayed platforms
• Instructors and competitors requiring consistent, repeatable trigger reset without manual manipulation

Shipping & FFL

This product is classified as a firearm component and is not subject to NFA regulations; however, it may be restricted in certain states and localities. Check your local laws before ordering. This item ships via standard ground service to your chosen FFL dealer. A signed copy of the receiving FFL’s license is required at the time of order. Rare Breed triggers are not available for shipment to California, New York, New Jersey, Massachusetts, Connecticut, Washington D.C., or any jurisdiction that prohibits the sale or possession of forced-reset trigger mechanisms. All sales are final. The end user assumes all responsibility for compliance with applicable federal, state, and local laws regarding the installation and use of the FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K.