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

Rare Breed introduces the FRT-RD3 (AMBI) Two-Stage (3-Position) Forced Reset Trigger, engineered specifically for the HK MP5, MP5K, SP5, and SP5K platforms. This drop-in trigger assembly integrates the forced-reset firing cycle with an ambidextrous selector, providing a distinct mechanical advantage for shooters operating in the HK roller-delayed ecosystem. The FRT-RD3 (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 and SP5K maintains the precision fit and material standards expected from Rare Breed components.

Overview

The FRT-RD3 leverages a forced-reset mechanism that resets the trigger forward under spring tension immediately after each shot, allowing the shooter to control the firing cycle through trigger manipulation rather than relying on standard semi-automatic timing. This three-position selector includes safe, semi-automatic, and forced-reset positions, giving the operator direct control over the action. Designed exclusively for HK-pattern roller-delayed blowback firearms, this trigger assembly requires no permanent modification to the host firearm and is compatible with standard lower receiver groups.

Features and Specs

The FRT-RD3 (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 and SP5K is built around precision-machined steel components with a hard-coat anodized finish for corrosion resistance and consistent trigger pull. The two-stage design provides a defined take-up wall before the forced-reset cycle engages. Below are the core specifications and features:

• Manufacturer: Rare Breed. Category: Triggers. Designed exclusively for HK MP5, MP5K, SP5, and SP5K platforms.
• Three-position ambidextrous selector with safe, semi-automatic, and forced-reset modes. Ambidextrous safety lever accommodates left- and right-handed shooters.
• Drop-in installation with no permanent modification required. Includes all necessary springs, pins, and selector components for complete lower receiver assembly.

The trigger housing is constructed from 7075-T6 aluminum with a MIL-SPEC type III hard-coat anodized finish. Internal components are machined from S7 tool steel for impact resistance and dimensional stability under cyclic load. The trigger pull weight is factory-set between 5.5 and 6.5 pounds on the semi-automatic setting, with the forced-reset position requiring consistent rearward pressure to maintain the firing cycle.

• Two-stage trigger geometry with a defined first-stage take-up and a crisp second-stage break in semi-automatic mode.
• Forced-reset position utilizes a mechanical cam system that resets the trigger forward upon bolt return, enabling controlled rapid fire.
• Tested to 15,000 cycles with no degradation in sear engagement or reset timing. Each unit is individually function-checked before shipment.

Who It Is For

The FRT-RD3 (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 and SP5K is designed for experienced shooters who operate roller-delayed blowback platforms and require a trigger system that delivers repeatable, consistent reset characteristics. This product is intended for competitive shooters, firearms enthusiasts, and professionals who understand the mechanical operation of forced-reset triggers and can maintain proper trigger discipline. It is not recommended for novice shooters or those unfamiliar with advanced trigger mechanics. Users should verify compatibility with their specific host firearm prior to purchase, as variations in receiver specifications may affect fitment.

Shipping and FFL

This trigger assembly ships directly to your door. No Federal Firearms License (FFL) transfer is required for this product as it is a firearm component and not a firearm receiver. All sales are final on trigger assemblies. Shipment is via UPS Ground with signature confirmation required. International shipping is not available. Customers must comply with all applicable state and local laws regarding the possession and installation of aftermarket trigger components. It is the responsibility of the purchaser to verify that this product is legal in their jurisdiction prior to ordering.

FFL DISCLAIMER: This product is a trigger assembly and is not classified as a firearm under federal law. No FFL transfer is required. However, local, state, and municipal laws may impose restrictions on the sale, possession, or installation of forced-reset trigger assemblies. By purchasing this product, the buyer certifies that they are in compliance with all applicable laws and regulations in their jurisdiction. Rare Breed disclaims any liability for misuse or improper installation of this component.

• No FFL transfer required for this trigger assembly. Ships directly to the purchaser.
• Signature required upon delivery. Valid government-issued identification required for age verification.
• Buyer assumes all responsibility for compliance with local, state, and federal laws regarding forced-reset trigger ownership and use.