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

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K represents a precision-engineered drop-in upgrade for roller-delayed blowback platforms. Manufactured by Rare Breed and categorized under Triggers, this unit leverages a two-stage, three-position selector mechanism to deliver a controlled forced-reset cycle. Designed exclusively for Single-Edge Fire (SEF) trigger housings, the FRT-RD3™ integrates with standard HK push-pin lower assemblies without permanent modification to the host firearm. Each component is machined from billet steel and heat-treated to military-grade hardness specifications, ensuring dimensional stability under sustained firing schedules.

Overview

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K utilizes a patented forced-reset sear geometry that re-engages the hammer after each shot cycle, requiring the shooter to maintain forward pressure on the trigger for subsequent discharges. The three-position selector provides safe, semi-automatic, and forced-reset modes. In the forced-reset position, the trigger mechanism automatically resets after the bolt carrier cycles, allowing for rapid follow-up shots while remaining legally classified as a semi-automatic trigger system. The unit is compatible with standard HK push-pin configurations and does not require modification to the bolt carrier group or receiver.

Features & Specs

• Manufacturer: Rare Breed; Category: Triggers; Platform: HK MP5, MP5K, SP5, SP5K (SEF trigger housing required)
• Three-position selector: Safe (position 0), Semi-automatic (position 1), Forced-reset (position 2); two-stage trigger pull with defined wall and crisp break
• Drop-in design using factory push pins; includes reinforced trigger return spring and hardened steel disconnector; no gunsmithing required for installation

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K incorporates a dual-stage cam system that separates the sear engagement and forced-reset functions into distinct mechanical phases. The first stage provides approximately 2.5 to 3 pounds of take-up, while the second stage breaks at 4.5 to 5.5 pounds. In forced-reset mode, the trigger resets approximately 0.050 inches forward of the break point after each cycle, enabling rapid, controlled firing sequences. All internal surfaces are EDM-cut to +/-0.001 inch tolerances and receive a manganese phosphate finish for corrosion resistance and reduced friction.

Who It's For

This trigger is intended for HK MP5, MP5K, SP5, and SP5K owners who require a mechanically repeatable forced-reset system for competitive shooting, training, or range use. Users should have a working knowledge of roller-delayed blowback actions and trigger group maintenance. The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is not recommended for duty or self-defense applications due to the specific manual of arms required for forced-reset operation. Individuals who regularly shoot in high-round-count drills or timed competitions will benefit from the consistent reset travel and minimal over-travel adjustment built into this unit.

• Competitive shooters running HK roller-delayed platforms in USPSA, PCC, or outlaw matches who need consistent reset characteristics
• Enthusiasts with existing SEF trigger housings seeking a drop-in upgrade without replacing the entire lower assembly
• Collectors and precision shooters who require documented, specification-driven trigger components for HK SP5 and MP5 variants

Shipping & FFL

This FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is classified as a firearm component and ships directly to residential addresses within the United States. No Federal Firearms License (FFL) transfer is required for purchase or delivery. However, end users must comply with all applicable federal, state, and local laws regarding trigger ownership and installation. Rare Breed and the selling retailer assume no liability for improper installation, misuse, or legal non-compliance. Customers are advised to verify local ordinances before ordering. Standard shipping rates apply; expedited options are available at checkout.

• No FFL required for shipment to residential addresses; ships via insured ground service
• Buyer assumes all responsibility for compliance with state and local laws regarding trigger mechanisms
• Return policy: unopened, unused units may be returned within 30 days for refund less shipping; installation voids eligibility