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

If you run an HK roller-delayed platform, you already know the trigger can be the weak link. The Rare Breed FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K changes that entirely. This is a drop-in assembly that keeps the familiar HK feel while giving you a whole new level of control. It is not a gimmick. It is a purpose-built fire control group designed for shooters who want predictable, repeatable reset performance without swapping out your entire lower. We have tested this on MP5, MP5K, SP5, and SP5K variants, and it locks up tight with zero slop. If you have been waiting for a forced reset trigger that actually works on these pistols and rifles, this is 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 reliable, ambidextrous forced reset system on roller-delayed guns. Unlike standard single-stage FRT units, this two-stage design gives you a defined take-up wall before the forced reset engages. The three-position selector allows safe, semi-automatic, and forced reset modes. The ambidextrous safety lever means left-handed shooters get the same tactile feedback and control as right-handed users. Rare Breed engineered this specifically for HK-pattern trigger housings, so you do not need to modify your firearm. It is a direct replacement that retains the factory hammer and sear engagement geometry where it matters most.

Features & Specs

• Two-stage trigger pull with a crisp wall and short, positive reset that returns the trigger forward under spring tension. The forced reset function is consistent across all firing positions.
• Three-position selector: safe, semi-automatic, and forced reset mode. The selector detents are positive and audible, with no mushiness between positions.
• Ambi safety lever included. Left-side and right-side paddles are machined from billet steel and use the same spring tension as the standard HK selector.

Additional specs include a nickel-Teflon coated trigger shoe for reduced friction, a hardened steel hammer that meets HK drop-safety requirements, and a proprietary reset spring pack that Rare Breed developed specifically for the MP5 platform. The FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K is manufactured in the USA by Rare Breed and falls under their standard lifetime warranty against manufacturing defects.

• Manufacturer: Rare Breed
• Category: Triggers
• Compatibility: HK MP5, MP5K, SP5, SP5K (including clones with standard HK trigger housing dimensions)

Who It’s For

This trigger is for the shooter who already understands the HK platform and wants to push its performance further without chasing aftermarket binary or aftermarket semi-auto drop-ins. If you compete in PCC matches, run tactical courses, or just enjoy fast, accurate follow-up shots on steel, the FRT-RD3 gives you a consistent reset that reduces split times without sacrificing trigger feel. It is also for the left-handed shooter who is tired of one-sided safety levers. The ambi selector is fully functional out of the box. If you own a SP5 or SP5K and want to keep it as a range toy or defensive carbine, this trigger adds capability without changing the core operating system of your firearm. It is not a competition-only part. It is a practical upgrade for anyone who shoots their HK regularly.

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, not a firearm. However, you must be at least 18 years old to purchase. We ship via UPS Ground with signature confirmation. Check your local and state laws before ordering. Some jurisdictions restrict the sale or possession of forced reset triggers. You are responsible for compliance with all applicable laws. If you have questions about compatibility with your specific firearm model, contact our support team before placing your order.