Description

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

If you own an HK MP5, MP5K, SP5, or SP5K, you already know the platform demands precision and reliability. The FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger from Rare Breed takes that performance to the next level. Designed for both right and left-handed shooters, this trigger delivers a crisp two-stage break with the added capability of a forced-reset function that lets you keep your finger on the trigger while the bolt resets the sear. It’s a purpose-built upgrade for your roller-delayed firearm, offering three distinct positions: Safe, Semi-Automatic, and Forced Reset. No guesswork, no gimmicks—just a solid, ambidextrous trigger system that feels natural from the first pull.

Overview

The FRT-RD3™ is Rare Breed’s dedicated forced reset trigger for the HK MP5, MP5K, SP5, and SP5K platforms. Unlike drop-in triggers designed for AR-style rifles, this unit is engineered specifically for the roller-delayed blowback system, meaning it fits correctly and functions reliably without modification. The ambidextrous safety selector makes it equally accessible for left-handed shooters, and the three-position design gives you clear, tactile feedback between modes. Whether you’re running drills at the range or upgrading a host firearm, the FRT-RD3™ provides a consistent, repeatable trigger pull that puts you in full control.

• Specifically engineered for HK MP5, MP5K, SP5, and SP5K variants—no adapter plates or fitting required
• Ambidextrous safety selector with three defined positions: Safe, Semi, and Forced Reset
• Two-stage trigger pull with a distinct wall and clean break for precision shooting

Features & Specs

This isn’t a one-size-fits-all trigger. Rare Breed designed the FRT-RD3™ (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K to handle the unique geometry of the roller-delayed action. The forced-reset function works by using the bolt’s forward movement to reset the trigger, allowing you to maintain a steady firing grip without changing your finger position. The two-stage pull gives you a take-up stage followed by a crisp second stage, making it easier to stay on target during rapid strings. All components are manufactured from hardened steel and finished to resist wear from repeated use.

• Two-stage trigger design: approximately 4.5 lb first stage, 2.5 lb second stage (total pull weight ~7 lb)
• Hardened steel hammer, sear, and disconnect for long-term durability under high-round-count use
• Ambidextrous safety lever with positive detent engagement in all three positions

Who It’s For

The FRT-RD3™ is built for shooters who want to maximize the performance of their HK MP5, MP5K, SP5, or SP5K without compromising safety or reliability. It’s ideal for competition shooters looking to shave split times, for collectors who want a period-correct upgrade that still functions as a modern trigger, and for anyone who appreciates the mechanical precision of a forced-reset system. Because it uses a two-stage pull, it also works well for precision work when you need to stage the trigger before breaking the shot. If you’re comfortable with your firearm’s manual of arms and want a trigger that keeps up with your cadence, this is a solid choice.

• Suited for right-handed and left-handed shooters thanks to the ambidextrous safety selector
• Works with standard HK MP5, MP5K, SP5, and SP5K lower receivers—no permanent modifications needed
• Designed for shooters who understand forced-reset operation and want a reliable, repeatable trigger system

Shipping & FFL

This item is a firearm component and does not require shipment to an FFL dealer. It ships directly to your doorstep. However, you must comply with all applicable federal, state, and local laws regarding trigger installation and ownership. Some jurisdictions may restrict forced-reset triggers or three-position selectors. It is your responsibility to verify that this product is legal to own and install in your location before purchasing. We recommend checking with your local firearms authority if you have any questions.