The FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K comes complete with essential parts as described: 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 represents a significant advancement in trigger system engineering for the HK MP5, MP5K, SP5, and SP5K platforms. Designed and manufactured by Rare Breed, this forced reset trigger delivers a unique shooting experience by mechanically resetting the trigger forward after each shot, enabling rapid follow-up shots without compromising control. This unit is engineered to function within the strictest tolerances, providing consistent performance in a variety of shooting conditions. As a drop-in upgrade for your HK roller-delayed firearm, the FRT-RD3™ (AMBI) offers a distinct alternative to traditional trigger systems, combining ambidextrous operation with a two-stage, three-position selector. Overview The FRT-RD3™ (AMBI) is a forced reset trigger that operates on a patented forced-reset mechanism. Unlike standard triggers that rely on spring tension alone, the FRT-RD3 uses the rearward motion of the bolt to physically push the trigger forward, resetting the sear for the next cycle. This mechanical action allows for a rapid, controlled firing sequence while maintaining the shooter's ability to interrupt the cycle at any point. The three-position selector offers safe, semi-automatic, and forced-reset fire modes, providing the user with tactical flexibility. The ambidextrous design ensures left-handed shooters maintain full functionality without modification. This trigger is specifically engineered for the HK MP5, MP5K, SP5, and SP5K platforms. It is not a generic component and requires no permanent modification to the host firearm. The unit is assembled with precision-machined steel components and a corrosion-resistant finish to withstand heavy use. The two-stage pull weight is factory-set to approximately 4.5 pounds on the first stage and 3.5 pounds on the second stage, delivering a crisp, predictable break. The forced-reset cycle is consistent across all ammunition types within SAAMI specifications. Features & Specs Mechanical Forced Reset: The trigger is physically reset by bolt carrier movement, enabling rapid follow-up shots while maintaining traditional trigger control. Ambidextrous Three-Position Selector: Features a safe, semi-automatic, and forced-reset fire mode, with mirrored controls for left and right-handed shooters. Drop-In Installation: No permanent modifications required. Designed to fit HK MP5, MP5K, SP5, and SP5K lower receivers without gunsmithing. Two-Stage Trigger Pull: First stage: ~4.5 lbs. Second stage: ~3.5 lbs. Clean break with minimal overtravel. Material Specifications: Hardened steel internal components; 7075-T6 aluminum housing; MIL-SPEC hard coat anodized finish. Compatibility: HK MP5, MP5K, SP5, SP5K, and semi-automatic variants using standard trigger pack geometry. Weight: 2.8 ounces (complete assembly). Operating Temperature: -20°F to 140°F. Warranty: Limited lifetime warranty against manufacturing defects from Rare Breed. Who It's For The FRT-RD3™ (AMBI) is engineered for experienced shooters who demand advanced trigger technology for competition, training, or recreational use. It is ideal for HK MP5 platform enthusiasts who want to maximize their firearm's cyclic potential without converting to a full-automatic configuration. This trigger is intended for legal use on semi-automatic firearms in jurisdictions where forced reset triggers are permitted. It is not recommended for novice shooters unfamiliar with forced-reset mechanics, as the trigger requires deliberate training to operate safely and effectively. The ambidextrous design makes it suitable for tactical applications where both support-hand and strong-hand operation are necessary. Shipping & FFL This product is classified as a firearm component and ships directly to your residential or business address. No Federal Firearms License (FFL) transfer is required for this item, as it is not a firearm receiver. However, state and local laws vary. It is your responsibility to verify that the FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is legal in your jurisdiction before ordering. Rare Breed and our retail partners do not assume liability for regulatory compliance. Standard shipping rates apply; expedited options are available at checkout. All sales are final on installed or modified components.

No. This product is a part or accessory and does not require an FFL for purchase or shipping.

While FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is legal in most states, always verify your local laws before placing an order. We comply with all state regulations.

In most cases, yes — Glock-compatible frames are designed to accept Glock OEM and compatible magazines. Always confirm fitment in the product details.

That depends on your state’s concealed carry laws. Once properly serialized and registered, carrying may be allowed under state law.

We ship all over the USA within 1–3 business days. You will receive tracking once shipped. Delivery times vary by carrier and region.