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

Designed and manufactured by Rare Breed, the FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K delivers a precision-engineered upgrade for HK-pattern firearms. This forced reset trigger system provides a distinct three-position selector, a two-stage pull, and ambidextrous control, allowing operators to achieve rapid, controlled follow-up shots while maintaining positive sear engagement. Built for demanding users who require reliable performance from their roller-delayed blowback platform, this trigger is a direct drop-in component for MP5, MP5K, SP5, and SP5K variants.

Overview

The FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K represents Rare Breed’s latest evolution in trigger technology. Unlike standard factory triggers, this unit incorporates a forced reset mechanism that mechanically returns the trigger forward after each shot, enabling a faster cyclic rate without modifying the firearm’s internal operating system. The ambidextrous selector accommodates both left- and right-handed shooters, while the three-position configuration provides safe, semi-automatic, and forced-reset fire modes. Each trigger is CNC-machined from billet steel and hard-coat anodized for durability in high-use environments.

Features & Specs

• Three-Position Selector: Safe, Semi, and Forced Reset positions allow the shooter to choose between standard semi-automatic fire or the accelerated forced-reset cycle. The selector is clearly marked and provides positive detent engagement.
• Ambidextrous Forced Reset Trigger: Fully ambidextrous safety and trigger mechanism, with left- and right-side selector levers included. No additional aftermarket parts required for left-handed operation.
• Two-Stage Pull: A crisp two-stage trigger pull with a defined take-up wall and a clean break. The forced reset function engages automatically in the third position, returning the trigger forward under spring tension after each discharge.

Who It’s For

This trigger is intended for experienced shooters, competitive marksmen, and HK platform enthusiasts who demand maximum control over their rate of fire. The FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is suited for range training, competition, and recreational shooting applications where split-second split times are critical. It is not recommended for users unfamiliar with forced-reset trigger dynamics or those who require a standard mil-spec trigger feel. Proper training and familiarity with the forced-reset function are advised before live-fire use.

• Designed for HK MP5, MP5K, SP5, and SP5K roller-delayed blowback firearms
• Drop-in installation with no permanent modifications to the host weapon
• Compatible with standard HK trigger housings and selectors

Shipping & FFL

This product ships directly to your door. No Federal Firearms License (FFL) transfer is required for this forced reset trigger, as it is classified as a firearm component, not a firearm receiver. However, local, state, and federal laws regarding trigger mechanisms and rate-of-fire devices vary. It is the customer’s sole responsibility to verify compliance with all applicable laws in their jurisdiction before purchasing. Rare Breed triggers are legal for sale in most states; however, some states or municipalities may restrict ownership or use. By purchasing this item, you acknowledge that you are not prohibited from possessing firearm components under federal or state law, and you agree to comply with all applicable regulations. If you are uncertain about the legal status in your area, consult a licensed attorney or your local law enforcement agency prior to ordering. Rare Breed recommends that all users review the most recent ATF guidance on forced reset triggers. This product is not a machine gun, does not convert a firearm to full-auto, and is sold strictly for lawful purposes.

• No FFL required for trigger assembly
• Ships via USPS Priority Mail or UPS Ground
• Signature may be required upon delivery