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 how smooth and iconic that roller-delayed action feels. But the trigger? That has always been the weak point. The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K changes everything. Rare Breed engineered this drop-in trigger to give you a crisp two-stage pull with a third position that forces the trigger forward after each shot. It is not a gimmick. It is a functional upgrade that lets you shoot faster while maintaining the control you expect from a two-stage design. The ambidextrous safety selector means lefties and righties can both run it hard without thinking about it.

Overview

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is Rare Breed’s answer to the demand for a faster, more responsive trigger in the HK platform. Unlike single-stage forced reset triggers that can feel mushy, the two-stage design gives you a defined wall before the break. The third position engages the forced reset function, which pushes the trigger shoe forward after each shot, allowing you to ride the reset and fire again quickly. This is not about modifying your firearm’s fire rate. It is about reducing the time between shots while keeping your finger in the right spot. The trigger housing is CNC-machined from billet aluminum, and all internal components are heat-treated steel. It drops directly into the lower receiver of your MP5, MP5K, SP5, or SP5K with no permanent modifications required.

Features & Specs

• Two-stage pull with a clean 2.5-pound first stage and a crisp 3.5-pound second stage. The forced reset in the third position gives you a consistent reset point that trains your finger to stay on the shoe.
• Ambi safety selector with 45-degree and 90-degree throw options. Both sides are independently adjustable to match your grip and hand size.
• Manufactured by Rare Breed in the United States. All components are precision-ground, polished, and coated with a corrosion-resistant finish for long-term reliability in adverse conditions.

Additional specs include a heat-treated stainless steel disconnector and sear, a reinforced trigger return spring, and a drop-in design that fits standard HK trigger packs. The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is compatible with both push-pin and clip-pin lower receivers. Weight is approximately 4.2 ounces. No gunsmithing is required for installation, though we recommend a qualified armorer if you are not comfortable with trigger pack disassembly.

Who It’s For

This trigger is for the shooter who wants to push their MP5 or SP5 platform beyond stock performance. If you compete in PCC divisions, train for tactical application, or just enjoy shooting fast and accurately at the range, the FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K gives you an edge. It is also ideal for left-handed shooters who need an ambi safety that does not add bulk. The two-stage pull means you can still stage the trigger for precision shots, then flip the selector to forced reset mode for rapid strings. This is not a novelty part. It is a serious tool for shooters who understand trigger control and want to reduce split times without sacrificing accuracy. Whether you are running a suppressor, an optic, or just iron sights, the FRT-RD3 works with your setup.

Shipping & FFL

This item ships directly to your doorstep. No FFL transfer is required because the FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is a firearm component and not a firearm frame or receiver. You must be 18 years or older to purchase and comply with all local, state, and federal laws. We recommend checking your local regulations before ordering. Some states have restrictions on forced reset triggers, and it is your responsibility to ensure legal ownership. We ship via UPS Ground with signature required. Orders placed before 2:00 PM EST typically ship same business day. Expedited shipping is available at checkout.