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

Designed for shooters who demand precision and speed, the FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is a drop-in upgrade engineered by Rare Breed. This trigger leverages a forced-reset mechanism to deliver rapid, controlled follow-up shots without modifying your firearm’s internal safety systems. Built specifically for the HK roller-delayed platform, it maintains standard semi-automatic function while providing a distinct two-stage pull and a third position for enhanced cycling control.

Overview

The FRT-RD3 (SEF) replaces your factory trigger pack with a patent-pending design that resets the trigger forward under recoil. This allows the shooter to maintain trigger contact during the cycling cycle, reducing split times while retaining legal semi-automatic operation. The three-position selector offers safe, semi-automatic, and a dedicated forced-reset mode that works with the HK MP5, MP5K, SP5, and SP5K. Unlike binary triggers, the FRT-RD3 does not fire on the release; it relies on bolt travel to reset the trigger, making it a distinct option for competition shooters and enthusiasts seeking a competitive edge.

Features & Specs

• Drop-in design: No permanent modifications required to your HK MP5, MP5K, SP5, or SP5K lower receiver. Simply remove the factory trigger pack and install the FRT-RD3.
• Three-position selector: Safe (S), Semi-Automatic (1), and Forced Reset (3). The third position is mechanically isolated to prevent unintended engagement.
• Two-stage pull: First stage take-up followed by a crisp second stage break. The forced-reset action then resets the trigger forward for the next shot.

Specifications:

• Manufacturer: Rare Breed
• Category: Triggers
• Platform: HK MP5, MP5K, SP5, SP5K (SEF-style grip frame)
• Material: Steel hammer and sear, aluminum housing
• Weight: Approximately 4.2 oz including all components
• Pull weight: 4.5-5.5 pounds (two-stage)

Who It’s For

This trigger is intended for experienced shooters who own an HK MP5, MP5K, SP5, or SP5K and want to increase their practical rate of fire without converting to full-auto. It is suitable for USPSA, 3-Gun, and tactical training environments where split times matter. If you are a competitive shooter looking to reduce your split times, or a collector who wants to explore the forced-reset trigger platform on a roller-delayed firearm, the FRT-RD3 (SEF) is a direct upgrade. It is not recommended for casual plinkers or first-time firearm owners due to the training required to safely operate a forced-reset trigger.

Shipping & FFL

This FRT-RD3 (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is classified as a firearm component and ships directly to your door. No FFL transfer is required for this trigger assembly. However, you must comply with all federal, state, and local laws regarding firearm parts installation. Rare Breed triggers are legal in most states, but some jurisdictions (including California, New York, and Washington, D.C.) may restrict forced-reset triggers. It is your responsibility to verify legality before purchasing. For questions regarding compatibility or regulatory compliance, contact our customer service team.