Description

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

The FRT-RD3™ (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K represents a significant engineering advancement in aftermarket trigger systems for roller-delayed blowback platforms. Manufactured by Rare Breed, a recognized leader in precision trigger components, this unit is designed to provide a distinct mechanical firing experience through a forced-reset function. The FRT-RD3™ integrates a two-stage, three-position selector system that allows the operator to choose between standard semi-automatic fire, a safe position, and a forced-reset mode. This trigger is machined to exacting tolerances to interface directly with HK MP5, MP5K, SP5, and SP5K lower receivers without requiring permanent modifications to the host firearm. The ambidextrous safety selector lever configuration ensures usability for both left- and right-handed shooters, making it a versatile upgrade for a wide range of users.

Overview

The FRT-RD3™ (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is a drop-in trigger assembly that replaces the factory trigger pack. It utilizes a forced-reset mechanism that mechanically returns the trigger forward after each shot, requiring the shooter to release and re-apply pressure for subsequent firing. The two-stage design provides a defined take-up before a crisp break, while the three-position selector offers safe, semi-automatic, and forced-reset modes. This trigger is engineered to maintain the safety and reliability standards expected from Rare Breed products, with components constructed from heat-treated steel and aircraft-grade aluminum.

Features & Specs

• Two-stage trigger mechanism with a forced-reset function: the first stage provides approximately 2.5 pounds of take-up, followed by a second stage break at approximately 4.5 pounds total pull weight in semi-automatic mode. In forced-reset mode, the trigger resets forward automatically after each discharge.
• Three-position selector: position 1 (safe), position 2 (semi-automatic fire), position 3 (forced-reset mode). The selector is fully ambidextrous, with dual levers that can be swapped or removed to suit user preference.
• Direct compatibility with HK MP5, MP5K, SP5, and SP5K variants. No gunsmithing, drilling, or permanent alteration to the host firearm is required. Includes all necessary pins and springs for installation.

Who It’s For

This trigger is intended for experienced firearm owners and competitive shooters who operate HK-pattern roller-delayed blowback carbines and pistols. The FRT-RD3™ (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is suited for range use, training applications, and skill development where trigger manipulation and shot timing are emphasized. It is not recommended for duty, self-defense, or concealed carry use due to the mechanical characteristics of the forced-reset system. Users should be familiar with the operation of forced-reset triggers and understand the specific manual of arms required for safe engagement. This product is designed for civilian legal use where compliant with all applicable federal, state, and local laws.

Shipping & FFL

This trigger is classified as a firearm component and does not require transfer through a Federal Firearms License (FFL) dealer for shipment within the United States. Rare Breed triggers are typically shipped directly to the purchaser’s address. However, individual state and local laws vary regarding the ownership and installation of forced-reset triggers. It is the sole responsibility of the purchaser to verify that the FRT-RD3™ (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is legal to possess and install in their jurisdiction. Some states or municipalities may restrict or prohibit forced-reset trigger mechanisms. By purchasing this product, you acknowledge that you are in full compliance with all applicable laws and regulations. Rare Breed and this retailer disclaim any liability for misuse or non-compliance with local statutes.