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

Overview

The FRT-RD3 (Ambidextrous) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K represents a precision-engineered upgrade for roller-delayed blowback platforms. Manufactured by Rare Breed, this trigger system integrates a forced-reset mechanism with a selectable two-stage trigger pull, offering three distinct operating positions. Designed specifically for the HK MP5, MP5K, SP5, and SP5K platforms, the FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K allows the shooter to cycle through semi-automatic, forced-reset, and safe modes without compromising the weapon’s original safety standards. The ambidextrous selector configuration ensures compatibility with left- and right-handed operators, while the two-stage geometry provides a defined wall and crisp break during standard semi-automatic use. When engaged in the forced-reset position, the trigger resets forward under bolt carrier momentum, enabling a rapid cyclic rate consistent with the platform’s original design parameters.

Features & Specs

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K incorporates Rare Breed’s proprietary forced-reset technology within a drop-in housing that replaces the factory trigger pack. Key specifications and design elements include:

• Three-position selectable operation: safe, semi-automatic (two-stage), and forced-reset (two-stage) modes
• Ambidextrous selector lever compatible with HK MP5, MP5K, SP5, and SP5K lower receivers
• Two-stage trigger geometry with a defined first-stage take-up and a crisp second-stage break in both semi and forced-reset modes
• Constructed from 4140 steel and 7075-T6 aluminum with a MIL-SPEC hard-coat anodized finish
• Drop-in installation requiring no permanent modification to the host firearm; includes all necessary springs and pins
• Rated for continuous use with standard and +P ammunition; tested to exceed 10,000 cycles without performance degradation

The forced-reset mechanism operates by utilizing the bolt carrier’s forward momentum to mechanically reset the trigger sear, allowing the shooter to maintain trigger contact while the system cycles. This design, integrated into the FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K, relies on the firearm’s normal recoil impulse and does not modify the bolt carrier group or recoil spring assembly.

Who It’s For

This trigger system is intended for experienced shooters and professional users who require a selectable forced-reset capability in a roller-delayed blowback platform. The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is designed for individuals who understand the mechanical operation of forced-reset triggers and seek a drop-in upgrade that maintains the original safety and reliability characteristics of the HK platform. It is suitable for range use, competitive shooting disciplines that permit forced-reset triggers, and training applications where cyclic rate manipulation is a skill objective. The ambidextrous controls make it equally accessible to left-handed and right-handed operators. This product is not recommended for shooters unfamiliar with forced-reset trigger dynamics or those seeking a standard single-stage trigger replacement.

Shipping & FFL

This FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is classified as a firearm component and may ship directly to your address. No Federal Firearms License (FFL) transfer is required for this trigger unit, as it is not a firearm frame or receiver. However, you must verify that the installation of this trigger in your firearm complies with all applicable federal, state, and local laws. Some jurisdictions restrict or prohibit forced-reset triggers. It is your responsibility to ensure legal compliance before ordering. Rare Breed triggers are intended only for use in legal semi-automatic configurations; any modification to the host firearm to alter its classification is unlawful. If you have questions regarding your state or local regulations, consult with a qualified firearms attorney before purchase.