Description

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

Overview

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger from Rare Breed represents a distinct advancement in trigger engineering for the HK MP5, MP5K, SP5, and SP5K platforms. This drop-in assembly leverages a two-stage, three-position selector system that integrates the forced reset mechanism with the traditional single, safe, and burst-style selector positions found on SEF-pattern housings. Designed for users who require a repeatable, high-speed cycling interface without modifying the firearm’s lower receiver, this unit is machined from billet steel and heat-treated to MIL-SPEC hardness standards. The FRT-RD3™ operates by mechanically resetting the trigger face forward immediately after each shot, allowing the shooter to maintain consistent finger placement for the next cycle. It is compatible with standard HK MP5, MP5K, SP5, and SP5K trigger packs and requires no permanent alterations to the host firearm.

Features & Specs

• Two-stage trigger pull: first stage take-up of 2.5–3.0 lbs followed by a crisp second stage break at 4.0–4.5 lbs, measured with a calibrated Lyman digital gauge at 72°F
• Three-position selector: safe, semi-automatic, and forced-reset mode (FR mode); SEF-style indexing compatible with HK MP5, MP5K, SP5, and SP5K lower receivers
• Forced reset mechanism: uses a hardened steel cam and sear engagement geometry that actively returns the trigger to the forward position after each discharge, independent of spring tension alone
• Construction: billet 4140 chromoly steel, black nitride finish per MIL-DTL-13924, corrosion-resistant and wear-tolerant to 25,000+ cycles
• Drop-in installation: no gunsmithing required; replaces factory trigger pack in OEM HK and licensed clones (MP5, MP5K, SP5, SP5K) with SEF or ambidextrous SEF-style housings

Who It’s For

This FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger is suited for competitive shooters, advanced marksmen, and firearms professionals who operate the HK MP5, MP5K, SP5, or SP5K platform and demand a higher cyclic rate with precision control. It is intended for users already familiar with forced reset trigger dynamics and who require a robust, repeatable mechanical interface that does not rely on user technique to achieve consistent reset timing. The two-stage pull weight and three-position selector make it adaptable for both slow-fire accuracy drills and rapid follow-up shot sequences. This product is not recommended for novice shooters or those unwilling to undergo dedicated training on forced reset trigger operation. It is designed exclusively for the SEF-pattern HK trigger pack interface and will not fit push-pin or paddle-release variations without additional housing modification.

Shipping & FFL

This trigger component is classified as a firearm part and does not require transfer through a Federal Firearms License (FFL) dealer for shipment within the United States. However, the FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is regulated under federal law as a firearm component that may be subject to state or local restrictions. It is the customer’s sole responsibility to verify that ownership and installation of this product does not violate any applicable laws in their jurisdiction. Rare Breed and the retailer disclaim all liability for non-compliance with local, state, or federal regulations. Standard shipping rates apply, and delivery is to the address on file; signature may be required at the carrier’s discretion. No returns are accepted after installation due to the mechanical nature of the forced reset system. If you have questions about compatibility with your specific HK MP5, MP5K, SP5, or SP5K model, contact our technical support team before purchasing.