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

If you run 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 for the HK MP5, MP5K, SP5 & SP5K brings a level of trigger control and cyclic speed that simply wasn’t available for this roller-delayed system until now. Rare Breed engineered this drop-in unit specifically for the HK platform, so you get the same forced-reset functionality you expect, but in a compact, ambidextrous package that works with both full-size and K-model hosts.

Overview

The FRT-RD3 is a two-stage, three-position forced reset trigger that uses the shooter’s trigger finger to reset the sear during the bolt’s forward travel. This means you can achieve rapid follow-up shots without modifying the firearm’s internal bolt carrier group or sear block. The ambidextrous safety selector and trigger shoe make it equally usable for left-handed or right-handed shooters. It mounts directly into your standard MP5 or SP5 lower receiver with no permanent modifications, and it retains the factory hammer and sear geometry where it counts.

Features & Specs

• Two-stage trigger pull with a distinct wall before the forced-reset break, giving you a tactile feel for precision shots and a predictable reset point.
• Three-position safety selector: safe, semi-automatic, and forced-reset mode. The third position is clearly marked and audible, reducing confusion during high-speed drills.
• Ambidextrous controls for both the safety selector and the trigger shoe, designed to clear standard HK trigger housings without binding.

This FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is machined from billet steel and hardcoat anodized for durability. The trigger shoe uses a textured face to prevent finger slip during rapid fire. It weighs approximately 3.2 ounces and fits all factory HK and licensed SP5 lower receivers without requiring any aftermarket grip modules or trigger housings. The sear engagement surfaces are hand-finished to ensure consistent reset force shot after shot.

Who It’s For

This trigger is built for the experienced HK shooter who wants to push the MP5 or SP5 platform beyond standard semi-automatic rates of fire. It’s ideal for competitive shooters in PCC divisions that allow forced-reset triggers, as well as for collectors and enthusiasts who appreciate the engineering behind a true two-stage forced-reset system. If you own multiple HK-pattern guns, the ambidextrous design means you can swap it between an SP5 and an MP5K without reconfiguring your controls.

• Owners of HK MP5, MP5K, SP5, and SP5K rifles and pistols who want a drop-in upgrade with no gunsmith fitting.
• Shooters who prefer a two-stage trigger over the standard single-stage HK feel but still want the cyclic speed of a forced-reset system.
• Anyone who values lefty-friendly controls and a clear, tactile safety selector that won’t accidentally slip between positions.

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is not a binary trigger, and it does not convert your firearm to full-auto. It requires deliberate trigger discipline and a solid grip to maintain the forced-reset cycle. This is a hands-on upgrade for shooters who understand their equipment and want to maximize the HK platform’s potential without permanent alterations.

Shipping & FFL

This trigger is classified as a firearm component and ships directly to your door with no FFL transfer required. However, you must be at least 18 years of age and legally eligible to own firearm parts. Some states and localities have specific restrictions on forced-reset triggers. It is your responsibility to verify that this product is legal in your jurisdiction before ordering. We ship via UPS ground or USPS Priority Mail, and tracking information is provided at checkout. No signature is required, but we recommend shipping to a secure address. If you have any questions about compatibility with your specific HK or SP5 model, please contact our customer service team before placing your order.