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

The FRT-RD3™ (SEF) 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 drop-in trigger assembly redefines the shooting experience through a patented forced-reset mechanism that operates across three distinct selector positions. Designed specifically for HK-pattern firearms in Single / Ease / Fire (SEF) configuration, this trigger integrates seamlessly with MP5, MP5K, SP5, and SP5K variants without permanent modification to the host firearm.

Overview

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K utilizes a two-stage force curve that delivers a crisp, predictable break in semi-automatic mode while enabling a unique forced-reset cycling behavior in the third position. Each trigger unit is machined from billet 7075-T6 aluminum and hardened steel components, ensuring dimensional consistency within the tight tolerances required by HK-pattern trigger packs. The trigger shoe maintains the classic SEF profile for compatibility with standard HK safety markings and selector levers.

Features & Specs

This trigger system is engineered for shooters who demand mechanical precision and repeatable performance. The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K incorporates Rare Breed’s proprietary forced-reset technology, which physically returns the trigger forward after each shot cycle, allowing the shooter to manage the trigger reset cadence manually.

• Three-position selector: Safe, Semi-Automatic, and Forced-Reset (3-Position SEF configuration)
• Two-stage trigger pull: approximately 4.5 to 5.5 pounds first stage with a defined wall and clean break
• Drop-in installation: no permanent modification to the HK trigger housing or lower receiver required

• Forged and machined 7075-T6 aluminum housing with MIL-SPEC hard coat anodizing
• Heat-treated chrome-silicon steel trigger and hammer components for wear resistance
• Compatible with factory HK MP5, MP5K, SP5, and SP5K lower receivers in SEF configuration

• Forced-reset mechanism: mechanical trigger return independent of bolt carrier dwell time
• Positive sear engagement with over-travel stop for consistent lock-up
• Includes replacement trigger, hammer, disconnector, and all necessary springs and pins

Who It’s For

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is intended for experienced shooters who own HK-pattern roller-delayed firearms and seek a trigger system that offers both precision semi-automatic performance and an advanced mechanical reset feature. This product is designed for use in legal semi-automatic configurations only. It is not a full-automatic device, nor does it convert a firearm to full-automatic operation. Users must operate the trigger in compliance with all applicable federal, state, and local laws. This trigger is suitable for range use, competitive shooting disciplines that permit forced-reset triggers, and firearm enthusiasts who value mechanical innovation and component quality.

Shipping & FFL

This product is classified as a firearm component and does not require transfer through a Federal Firearms License (FFL) dealer for shipment within the United States. However, customers are responsible for verifying that the FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is legal to own and install in their state and municipality. Some jurisdictions have enacted restrictions on forced-reset triggers, binary triggers, or trigger-actuated devices. It is the purchaser’s sole responsibility to ensure compliance with all local, state, and federal laws prior to ordering. We reserve the right to cancel any order that violates applicable law. Standard shipping rates apply; expedited options are available at checkout.