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

If you run a roller-delayed platform, you already know the HK MP5, MP5K, SP5, or SP5K demands a trigger that can keep up. The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K from Rare Breed brings a familiar forced-reset feel to this iconic system. We have spent time with this unit on the range, and it delivers a clean, repeatable two-stage pull with a third position that resets the trigger under recoil. It is built for shooters who want performance without guesswork.

Overview

Rare Breed designed the FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K to drop directly into your HK-pattern firearm. Unlike traditional single-stage forced reset triggers, this unit offers a distinct two-stage feel in the first two positions, while the third position enables the forced reset function. The ambidextrous safety selector makes it equally usable for left- and right-handed shooters. We have found the installation straightforward, and the trigger does not require permanent modification to your lower receiver.

Features & Specs

• Manufacturer: Rare Breed; Category: Triggers; fits HK MP5, MP5K, SP5, and SP5K models
• Two-stage trigger with three selectable positions: safe, semi-automatic, and forced reset
• Ambidextrous safety selector included for left- and right-handed operation
• Drop-in design; no permanent alterations required to install in standard HK trigger housings
• Durable steel construction with a corrosion-resistant finish for extended service life
• Consistent pull weight and reset point across the two-stage and forced reset modes

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K uses a proprietary sear geometry that allows the trigger to reset forward under recoil in the third position. In the first two positions, you get a crisp two-stage break typical of a quality duty trigger. The ambi safety is positive without being stiff, and the selector detents are well-defined.

Who It’s For

This trigger is built for the experienced HK owner who wants more control over their rate of fire without moving to a full-auto setup. It is ideal for competitive shooters practicing controlled pairs or rapid strings, as well as for enthusiasts who appreciate the mechanical innovation behind forced reset triggers. If you have a registered SBR or a pistol-brace MP5K, the compact ambi design works well in tighter configurations. It is also suited for left-handed shooters who have struggled to find an ambi trigger that maintains a true two-stage feel in a forced-reset package.

We recommend this trigger for anyone comfortable with basic firearm disassembly and who understands the function and legal implications of a forced reset trigger. It is not a beginner upgrade, but for the informed shooter, it delivers a unique and repeatable shooting experience.

Shipping & FFL

This FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is a firearm component and does not require transfer through a Federal Firearms License (FFL) for shipment within the United States. However, local, state, and federal laws vary. It is your responsibility to verify that this trigger is legal to own and install in your jurisdiction. Some states and localities restrict forced reset triggers. We ship to all states where legally permissible, and we recommend checking with your local law enforcement or attorney before ordering. Rare Breed triggers are intended for use in semi-automatic firearms only. By purchasing, you confirm compliance with all applicable laws.