Description

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

The FRT-RD3™ (AMBI) is a precision-engineered, three-position forced reset trigger system from Rare Breed, designed exclusively for the HK MP5, MP5K, SP5, and SP5K platforms. This trigger offers a distinct mechanical cycling behavior that resets the trigger forward under recoil, enabling a rapid follow-up shot cadence while maintaining semi-automatic compliance. The ambidextrous design and two-stage, three-position selector provide operators with a refined control interface for tactical, competitive, and training applications. Built to MIL-SPEC tolerances, the FRT-RD3™ delivers consistent performance across all factory-spec HK roller-delayed blowback firearms.

Overview

The FRT-RD3™ (AMBI) represents a dedicated drop-in trigger upgrade for the HK MP5 and SP5 series. Unlike standard single-stage triggers, this unit utilizes a forced-reset mechanism that physically returns the trigger shoe to its forward position after each shot, driven by the bolt carrier group’s rearward travel. The three-position selector allows the user to choose between Safe, Semi-Automatic (standard trigger function), and the forced-reset mode (position 3). This system is engineered for shooters who require a consistent, repeatable firing cycle at elevated rates without modification to the host firearm’s lower receiver. The ambidextrous selector lever ensures full functionality for left- and right-handed operators.

Features & Specs

• Ambi three-position selector (Safe, Semi, FRT) designed for HK MP5, MP5K, SP5, and SP5K lower receivers
• Two-stage trigger pull with a distinct wall before break; forced-reset function returns trigger shoe forward automatically during cycling
• Manufactured by Rare Breed, Category: Triggers; includes all internal components for direct drop-in installation

The FRT-RD3™ (AMBI) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K is constructed from heat-treated steel and precision-machined billet components. The trigger housing is CNC-machined to fit factory HK trigger pockets without modification. The hammer is engineered for reliable primer strike on 9mm NATO-spec ammunition. The selector detent spring and plunger are included, providing crisp positive engagement between all three positions. This unit is not compatible with aftermarket trigger housings or modified sear blocks.

• Drop-in design: no gunsmithing required; replaces factory trigger pack in HK MP5, MP5K, SP5, and SP5K
• Ambi selector lever extends to both sides of receiver for ambidextrous manipulation
• Two-stage pull weight: approximately 4.5 to 5.5 lbs first stage, 3.0 to 4.0 lbs second stage (specifications subject to manufacturing variance)

Who It’s For

This trigger system is intended for experienced shooters, competitive 3-gun and PCC participants, and firearms professionals who require advanced trigger control on the HK roller-delayed platform. The FRT-RD3™ (AMBI) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K is suitable for range training, tactical drills, and performance shooting where consistent shot placement and rapid follow-up capability are demanded. Users should be familiar with forced-reset trigger operation and adhere to all applicable federal, state, and local laws regarding trigger modifications and rate-of-fire restrictions. This product is not recommended for novice shooters or for use in fully automatic firearms.

• Compatible with HK MP5, MP5K, SP5, SP5K, and semi-automatic clones using factory-spec trigger pockets
• Ideal for shooters seeking ambidextrous control and a two-stage trigger feel with forced-reset capability
• Not for use in machine guns, post-sample firearms, or any configuration that exceeds semi-automatic operation

Shipping & FFL

This trigger component is classified as a firearm part and does not require transfer through a Federal Firearms License (FFL) for shipment within the United States. However, buyers must comply with all state and local regulations governing the sale and possession of trigger assemblies. It is the purchaser’s responsibility to verify that this product is legal to own and install in their jurisdiction. Rare Breed triggers are not legal in all states; check your local laws before ordering. We ship via UPS or FedEx with adult signature required. No returns on installed or modified trigger units. FFL dealers may order directly through our wholesale division.