Description

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

Designed for serious shooters who demand precision and speed, the FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K represents a significant advancement in trigger technology. Manufactured by Rare Breed, this forced reset trigger (FRT) system offers a unique three-position selector that allows the operator to choose between safe, semi-automatic, and forced-reset fire modes. Built specifically for the HK roller-delayed platform, it provides a distinct tactile and auditory reset that enables rapid follow-up shots without modifying the firearm’s internal receiver group. For California customers, this trigger is engineered to comply with state regulations while delivering performance that meets the needs of competitive shooters and tactical users alike.

Overview

The FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is a drop-in replacement trigger pack designed for ambidextrous operation. It retains the familiar two-stage pull weight but introduces a forced-reset mechanism that physically returns the trigger forward after each shot, allowing the shooter to fire again with minimal finger movement. Unlike standard triggers, the FRT-RD3™ uses a patent-pending cam system that disengages the hammer and resets the trigger simultaneously, creating a consistent cyclic rate controlled by the shooter’s trigger finger. This unit is compatible with both full-size and K-model variants, including HK SP5 and SP5K pistols, and requires no permanent modifications to the host firearm.

Features & Specs

The FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K incorporates precision-machined components and a ruggedized design to withstand high-round-count use. Below are the key specifications and features:

• Manufacturer: Rare Breed – Industry leader in forced reset trigger systems with a track record of reliability in AR-15 and HK platforms.
• Selector Positions: Three positions – Safe, Semi-Automatic (standard semi-auto fire), and Forced Reset (FRS) mode for rapid, controlled fire.
• Ambidextrous Safety Selector: Fully reversible lever that accommodates left- and right-handed shooters without additional adapters.

Additional performance characteristics include a crisp two-stage break with approximately 4.5 to 5.5 pounds of pull weight in semi-auto mode, and a consistent forced-reset cycle that returns the trigger to the ready position after each shot. The unit is constructed from 4140 steel and 7075 aluminum, with a Mil-Spec hardcoat anodized finish for corrosion resistance. It is compatible with all factory-spec HK MP5, MP5K, SP5, and SP5K receivers, including those manufactured by HK, PTR, and Zenith.

• Dimensions: Drop-in fit – no gunsmithing required; includes all necessary springs and pins.
• Weight: Approximately 6.8 ounces (complete trigger pack assembly).
• Warranty: Backed by Rare Breed’s limited lifetime warranty against defects in materials and workmanship.

Who It’s For

This trigger is intended for experienced shooters who understand the mechanics of forced-reset systems and operate within legal boundaries. It is ideal for competition shooters in USPSA, IDPA, or 3-Gun divisions where rapid fire is permitted, as well as for tactical trainers who want to simulate high-volume fire without converting to full-automatic. Law enforcement and security professionals who rely on HK roller-delayed carbines for duty use will appreciate the ambidextrous interface and predictable reset. Because the FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K maintains a two-stage design, it also suits precision shooters who need a consistent trigger pull for accurate shot placement. This product is not recommended for novice shooters or those unfamiliar with forced-reset mechanics.

• Competition shooters seeking faster follow-up shots while staying within semi-auto rules.
• HK platform enthusiasts who want to upgrade their SP5, SP5K, or MP5 clone without permanent modification.
• California residents who require a compliant forced-reset trigger that meets state legal standards for semiautomatic firearms.

Shipping & FFL

This product is classified as a firearm component and may be shipped directly to your address in most states. However, California customers must note that this trigger is considered a firearm part subject to state-specific regulations. Rare Breed triggers are designed to be compliant with California law as a drop-in trigger that does not convert the firearm to full-automatic. Before ordering, verify with your local law enforcement agency that possession and use of a forced-reset trigger is legal in your jurisdiction. All shipments require a signature upon delivery, and international orders are not accepted. For questions regarding compliance, contact our customer service team.

FFL Transfer Disclaimer: This item does not require transfer through a Federal Firearms License (FFL) dealer as it is not a firearm receiver or a complete firearm. However, California residents should consult with their local FFL or attorney regarding any state-level restrictions on forced-reset triggers. Rare Breed and this retailer assume no liability for misuse, illegal conversion, or non-compliance with local, state, or federal laws. By purchasing this product, you affirm that you are legally eligible to own firearm components and that you will use the trigger only in a manner consistent with all applicable laws.