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

Overview

If you run an HK roller-delayed platform, you know the factory trigger leaves room for improvement. The FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K brings Rare Breed’s forced-reset technology to your favorite 9mm host. This is not a gimmick—it is a purpose-built fire control group that gives you tactile control over each shot while maintaining compliance with ATF guidelines. The ambidextrous safety selector and three-position design let you choose between safe, semi-automatic, and forced-reset modes without swapping parts. Whether you are running suppressed or unsuppressed, this trigger delivers consistent reset feel and a crisp break that rewards disciplined trigger control.

Features & Specs

The FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K is manufactured by Rare Breed, a name trusted in the forced-reset trigger space. It drops directly into MP5, MP5K, SP5, and SP5K lower receivers with minimal fitting. The two-stage design provides a defined take-up wall before a clean break, while the forced-reset mechanism returns the trigger forward automatically after each shot. This allows you to focus on sight alignment and recoil management rather than manually resetting the shoe.

• Ambi safety selector with three positions: safe, semi, and forced-reset mode
• Two-stage trigger pull with a distinct wall and clean break
• Drop-in design for HK MP5, MP5K, SP5, and SP5K platforms

Each unit includes a reinforced hammer, sear, and disconnector built to handle the cyclic rate of a roller-delayed action. The trigger housing is machined from billet aluminum and finished with a hard-coat anodize to resist wear. Rare Breed tuned the reset geometry so the shoe returns forward aggressively but predictably, giving you positive feedback through the trigger finger.

• Billet aluminum housing with hard-coat anodized finish
• Reinforced hammer and sear for roller-delayed blowback cycling
• Aggressive but predictable forced-reset return for consistent follow-up shots

Who It’s For

This trigger is built for shooters who want to push the performance of their HK-pattern 9mm carbine or pistol without converting to a different operating system. If you already own an MP5, MP5K, SP5, or SP5K and find the factory trigger spongy or slow to reset, the FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K gives you a more predictable pull and faster follow-up capability. It suits competitive shooters looking to shave split times, collectors who want a rare-breed trigger in their roller-delayed gun, and enthusiasts who appreciate mechanical innovation. The ambi safety also makes it a natural fit for left-handed shooters or those who train with support-hand manipulation. This is not a beginner mod—it assumes you understand trigger discipline and safe firearm handling.

Shipping & FFL

This trigger ships directly to your doorstep with no FFL transfer required because it is a firearm component, not a firearm itself. However, you must ensure compliance with all local, state, and federal laws before ordering. Some jurisdictions restrict forced-reset triggers or have specific definitions regarding rate-of-fire devices. It is your responsibility to verify that the FRT-RD3 (ambi) two-stage (3-position) forced reset trigger for the HK MP5, MP5K, SP5 & SP5K is legal in your area. We do not accept returns on installed or modified triggers. If you have questions about legality, consult an attorney or contact your state attorney general’s office before purchase. By completing this transaction, you confirm you are legally allowed to possess this product.