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

Rare Breed continues to push the boundaries of trigger technology with the FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K. This drop-in assembly represents a significant engineering achievement, combining the durability of a forced-reset cycling system with the precision of a two-stage break. Designed specifically for the MP5 platform, this trigger offers a legitimate three-position selector function that respects the shooter’s control while delivering fast, repeatable shot cycles. The ambidextrous selector lever ensures that left-handed and right-handed operators can achieve the same level of performance without modification. Built from billet steel and Mil-Spec components, each unit is assembled and tested at the Rare Breed facility to meet strict quality standards for both law enforcement and civilian markets. As a forced reset trigger, the FRT-RD3 uses the firearm’s recoil energy to mechanically reset the trigger shoe, enabling a faster follow-up shot without altering the semi-automatic classification of the host weapon.

Overview

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is a drop-in replacement that eliminates the need for permanent modifications to your firearm. This trigger system features a two-stage pull that allows the shooter to take up slack in the first stage before reaching a crisp second-stage wall. The forced reset mechanism engages immediately after the hammer falls, pushing the trigger shoe forward so the shooter can reset without manually releasing the trigger. The three-position selector allows for safe, semi-automatic, and forced-reset modes, giving the operator full control over the firing sequence. This system is fully ambidextrous, with mirrored selector levers on both sides of the lower receiver. Rare Breed has designed this trigger to work with standard MP5, MP5K, SP5, and SP5K lower receivers, requiring no additional fitting or gunsmithing. The housing is constructed from heat-treated steel, and all internal components are precision-ground to minimize friction and wear over extended use.

Features & Specs

• Ambidextrous Forced Reset Mechanism: The FRT-RD3 uses a patented forced-reset cam system that mechanically returns the trigger shoe to the forward position after each shot, enabling rapid follow-up shots while maintaining semi-automatic function. The ambidextrous selector lever provides identical function on both sides of the firearm.
• Two-Stage Pull with 3-Position Selector: This trigger offers a two-stage pull with a defined take-up stage and a crisp second-stage break. The three-position selector provides safe, semi-automatic, and forced-reset modes. The forced-reset mode is engaged only when the selector is in the third position, allowing the shooter to choose between standard semi-automatic and forced-reset operation.
• Drop-In Installation for MP5/SP5 Platforms: Designed specifically for the HK MP5, MP5K, SP5, and SP5K, this trigger drops directly into factory or aftermarket lower receivers. No permanent modifications, drilling, or trigger pack adjustments are required. Includes all necessary pins and springs for installation.

• Specifications: Manufacturer: Rare Breed. Category: Triggers. Platform: HK MP5, MP5K, SP5, SP5K. Trigger Pull Weight: 5.5-6.5 pounds (two-stage). Selector Positions: 3 (safe, semi, forced-reset). Material: Billet steel housing, heat-treated internal components. Finish: Matte black nitride. Ambidextrous: Yes, with dual selector levers.

Who It’s For

This trigger system is designed for experienced shooters who require precise control over their MP5 platform. Competitive shooters seeking faster split times will benefit from the forced-reset mechanism, which reduces the time between shots without compromising accuracy. Law enforcement and tactical operators will appreciate the ambidextrous controls and the ability to switch between semi-automatic and forced-reset modes based on mission requirements. Collectors and enthusiasts who own HK SP5 or SP5K pistols can upgrade their trigger without altering the original configuration of the firearm. This product is not recommended for novice shooters or those unfamiliar with forced-reset trigger operation. Users should be familiar with safe firearm handling practices and understand the mechanical operation of forced-reset systems before installation. The FRT-RD3 is intended for use in semi-automatic firearms only and should not be modified or altered in any way.

Shipping & FFL

This product is a firearm component and does not require an FFL transfer for shipment within the United States. The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K ships directly to your door via UPS or FedEx ground with signature confirmation required. All applicable federal, state, and local laws regarding the purchase and possession of trigger components apply. You are responsible for verifying that this product is legal to own in your jurisdiction before placing an order. Rare Breed triggers are not restricted under the National Firearms Act (NFA) when used in a compliant semi-automatic firearm. However, some states and municipalities have specific regulations regarding forced-reset triggers. By purchasing this product, you certify that you are not prohibited from owning firearms or firearm components under federal or state law. Allow 7-14 business days for processing and delivery. International shipping is not available.