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

If you’ve spent any time behind an HK roller-delayed platform, you know the trigger is often the first thing you want to upgrade. The stock SP5 or MP5 trigger can feel mushy and vague, especially when you’re trying to shoot fast or run a match. That’s where the FRT-RD3™ from Rare Breed changes everything. Designed specifically for the MP5, MP5K, SP5, and SP5K, this ambidextrous two-stage forced reset trigger gives you a crisp break and a mechanical reset that keeps your finger moving. It’s a serious upgrade for anyone who wants more control and speed without modifying the lower receiver.

Overview

The FRT-RD3™ (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K is a drop-in replacement that uses a unique two-stage design. The first stage takes up the slack with a clean, predictable wall. The second stage breaks like a quality match trigger, but the real story is the forced reset: as the bolt cycles, the trigger is physically pushed forward, resetting your finger for the next shot. This gives you a natural, rhythmic firing cadence that’s faster than a standard trigger but still fully semi-automatic. The three-position selector (safe, semi, and forced-reset mode) works with your existing safety, and the ambidextrous layout means lefties don’t get left out.

Features & Specs

This trigger is built for hard use. Rare Breed uses heat-treated tool steel internals and a nickel-Teflon coated housing for smooth operation and corrosion resistance, which matters in Florida’s humidity. It fits standard HK-style trigger packs without permanent modification, though some users prefer a light trigger housing polish for best results. The forced reset mechanism is self-contained and doesn’t rely on aftermarket bolt carriers or recoil springs. It’s a direct upgrade for your SP5 or MP5.

• Ambidextrous safety selector and trigger blade for left- and right-handed shooters.
• Two-stage pull with a clean 4.5 to 5.5 pound break and a short, positive reset in semi-auto mode.
• Three-position selector: safe, semi-automatic, and forced-reset mode for rapid, controlled fire.

• Drop-in design with no permanent modifications required to the HK trigger housing or lower.
• Nickel-Teflon coated housing and hardened steel sear for smooth operation and long service life.
• Compatible with HK MP5, MP5K, SP5, and SP5K models using standard factory or aftermarket trigger packs.

• Forced reset mechanism cycles with the bolt to provide a consistent, repeatable trigger pull.
• Uses factory hammer and spring; no need to swap bolt components or recoil assemblies.
• Manufactured by Rare Breed, known for reliable forced-reset triggers in the AR platform.

Who It’s For

This trigger is for the Florida shooter who trains regularly and wants to squeeze more performance out of their HK roller gun. It’s ideal for competition shooters running USPSA PCC or 2-Gun who want faster splits without compromising accuracy. It also appeals to collectors and enthusiasts who appreciate the engineering behind a mechanical forced reset. If you shoot your SP5 often and find the stock trigger sluggish, this is a practical upgrade that makes the gun feel more responsive. It’s not a novelty—it’s a tool for shooters who understand trigger control.

Shipping & FFL

This product ships directly to your door. No FFL transfer is required because the FRT-RD3™ is a trigger assembly, not a firearm or firearm receiver. However, you must ensure compliance with all local, state, and federal laws before ordering. Florida residents are responsible for verifying that this trigger is legal in their county or municipality. We recommend checking with local law enforcement or an attorney if you have any questions about forced-reset triggers under current statutes. By placing an order, you confirm that you are legally allowed to possess this component.