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

The Rare Breed FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger is purpose-engineered for the HK MP5, MP5K, SP5, and SP5K platforms. This trigger delivers a distinct mechanical cycling advantage through a forced-reset design, allowing the shooter to achieve rapid follow-up shots with deliberate trigger control. Built for professionals and serious enthusiasts, the FRT-RD3™ integrates ambidextrous functionality and a selectable two-stage pull into a drop-in unit that respects the HK roller-delayed operating system.

Overview

The FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K represents a significant evolution in trigger technology. Unlike traditional triggers that rely solely on spring tension, this unit employs a forced-reset mechanism that physically returns the trigger forward after each shot, enabling a rapid cyclic rate when the shooter maintains rearward pressure and then resets. The three-position selector offers safe, semi-automatic, and forced-reset modes, while the ambidextrous controls ensure full usability for left- and right-handed operators. Rare Breed has calibrated this trigger specifically for HK’s roller-locked action, ensuring reliable function across various ammunition types.

Features & Specs

• Forced-Reset Mechanism: The FRT-RD3™ uses a patented forced-reset system that physically pushes the trigger forward after each shot, allowing the shooter to achieve a high cyclic rate through controlled trigger manipulation. This design does not alter the firearm’s semi-automatic classification.
• Two-Stage Pull with Ambidextrous Controls: The trigger provides a crisp two-stage pull weight of approximately 4.5 to 5.5 pounds, with a distinct wall before break. Ambidextrous safety selector and trigger paddle allow seamless operation for both right- and left-handed shooters.
• 3-Position Selector: Positions include safe (locked trigger), semi-automatic (standard single-shot), and forced-reset (FR) mode. The FR position enables the forced-reset function for rapid follow-up shots when properly manipulated.
• Drop-In Installation: Designed as a direct replacement for the factory trigger pack in HK MP5, MP5K, SP5, and SP5K models. No permanent modifications to the firearm are required; installation can be performed with standard tools.
• Durable Construction: Housing is machined from 7075-T6 aluminum with a hardcoat anodized finish. Internal components are CNC-machined from tool steel with a nitride coating for corrosion resistance and reduced friction.
• Manufacturer: Rare Breed | Category: Triggers | Compatibility: HK MP5, MP5K, SP5, SP5K (and clones with standard trigger pack dimensions)

Who It’s For

This trigger is designed for experienced shooters who demand maximum performance from their HK roller-delayed platform. It suits competition shooters seeking faster split times in practical events, law enforcement or military personnel who train with forced-reset systems, and collectors or enthusiasts who want to explore advanced trigger mechanics. The FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is not recommended for novice users or those unfamiliar with forced-reset operation, as proper technique is required for safe and reliable function. Users should be proficient in trigger control and understand the mechanical cycling of this system before use.

Shipping & FFL

This item ships directly to your address. No FFL transfer is required for the trigger assembly as it is not a firearm frame or receiver. However, local, state, and federal laws vary; it is your responsibility to ensure compliance with all applicable regulations. Rare Breed and our retailer do not assume liability for misuse or legal noncompliance. Always consult legal counsel if you are uncertain about the legality of forced-reset triggers in your jurisdiction. Standard shipping rates apply, and estimated delivery is 5-7 business days within the continental United States. International shipping is not available for this product.