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 precision-engineered upgrade for roller-delayed blowback platforms. Manufactured by Rare Breed, this ambidextrous forced reset trigger delivers a distinct two-stage pull with three selectable positions, allowing the operator to manage shot timing with mechanical consistency. Designed specifically for the HK MP5, MP5K, SP5, and SP5K, this trigger maintains the platform’s reliability while providing a tactile reset that enhances control during rapid strings of fire.

Overview

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K redefines the trigger interface on one of the most iconic sub-machine gun platforms in service. Rare Breed has engineered a drop-in assembly that replaces the factory trigger pack without permanent modification to the firearm. The three-position selector allows the shooter to choose between safe, standard semi-automatic, and the forced-reset mode. In forced-reset mode, the trigger mechanism mechanically resets the trigger forward after each shot, requiring the shooter to intentionally release and re-depress the trigger for each subsequent round. This mechanical action provides a consistent, repeatable trigger pull that reduces the variables introduced by human timing.

Features & Specs

• Ambi selector lever accommodates both right-handed and left-handed shooters without adapter plates or modification.
• Two-stage trigger pull: a short take-up stage followed by a crisp, defined wall before the break point.
• Three-position selector: safe (rear), semi-automatic (middle), forced-reset (forward) with positive detents at each position.

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K uses a hammer-forged steel sear and hardened tool steel engagement surfaces. The trigger housing is CNC-machined from 7075-T6 aluminum with a Type III hard coat anodized finish. Each unit is hand-assembled and function-tested at the Rare Breed facility before shipment. The forced-reset mechanism cycles reliably within the roller-delayed action, maintaining consistent trigger weight across all three positions.

• Drop-in fit for HK MP5, MP5K, SP5, and SP5K platforms – no gunsmithing required.
• Trigger pull weight: 5.5 to 6.5 pounds across all positions, measured at the factory.
• Overall length of trigger cassette matches factory specifications for direct installation.

Who It’s For

This trigger is built for the experienced HK platform owner who demands mechanical precision over variable human input. Competitive shooters training in speed and accuracy drills will benefit from the forced-reset mode’s consistent timing. Law enforcement and security professionals using MP5-platform firearms will find the ambidextrous selector advantageous in dynamic environments. Collectors and enthusiasts who maintain multiple HK variants appreciate the single trigger unit that works across MP5, MP5K, SP5, and SP5K models. The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is not a novelty item; it is a functional upgrade for shooters who understand the mechanics of their firearm and want to reduce shot-to-shot variability.

• Applicable for range training, competition, and defensive proficiency development.
• Suitable for shooters who prefer a two-stage break over a single-stage or mil-spec trigger.
• Compatible with standard HK lower receiver groups requiring no permanent alteration.

Shipping & FFL

This item is classified as a firearm component and is not regulated as a frame or receiver under current federal law. However, because the FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is a trigger assembly, it may be shipped directly to your residence in most states. Some states and municipalities impose restrictions on forced-reset trigger mechanisms. It is your responsibility to verify local, state, and federal laws before purchasing. Rare Breed products are not covered by a warranty for modifications, misuse, or unauthorized installation. All sales are final. By purchasing this product, you certify that you are legally eligible to own firearm components and that your jurisdiction permits ownership and use of forced-reset triggers. We do not ship to restricted locations. Standard shipping rates apply. Tracking is provided at time of shipment. No returns or exchanges on installed or used trigger components. FFL transfer is not required for this item under federal regulation, but your local laws may vary.