Description

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 is where the personality of the gun lives. The FRT-RD3 (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K changes that personality completely. Rare Breed built this drop-in unit to give you a crisp, predictable two-stage pull with the option to engage a forced-reset mode that resets the trigger forward under recoil. You get precise control for slow fire and a dramatically faster cyclic rate when you need to push the pace. No guesswork, no mush, just repeatable performance from the first round to the last.

Overview

This is not a gimmick. The FRT-RD3 is a mechanical trigger system that uses a three-position selector to let you choose between safe, standard semi-automatic fire, and a forced-reset mode. In the forced-reset position, the trigger blade resets forward automatically as the bolt cycles, so you are effectively riding the reset without having to fully release the trigger. The ambidextrous safety lever means left-handed shooters or those running a support-hand grip get the same access. It fits standard HK MP5, MP5K, SP5, and SP5K lower receivers with no permanent modification required. Expect a solid, tactile click through each position, and a trigger break that stays consistent regardless of which mode you select.

Features & Specs

• Three-position ambidextrous selector: safe, standard semi-automatic, and forced-reset mode. The lever is reversible for left- or right-handed shooters, and each position is clearly marked for quick identification under stress.
• Two-stage trigger pull in semi-auto mode: a smooth take-up stage followed by a clean, predictable break. The forced-reset mode delivers a short, repeatable trigger stroke that aligns with the bolt cycle for faster follow-up shots without sacrificing control.
• Drop-in design for HK roller-delayed platforms: direct fit for MP5, MP5K, SP5, and SP5K. No drilling, filing, or permanent alteration to the receiver. Standard trigger housing pins secure the unit, and installation takes minutes with basic tools.

Who It’s For

This trigger is for the shooter who wants more from their MP5 or SP5 without chasing a full-auto setup. If you compete in PCC divisions, run tactical drills, or just appreciate a trigger that feels deliberate in slow fire and aggressive in rapid strings, the FRT-RD3 bridges that gap. It suits right-handed and left-handed operators equally, thanks to the ambi selector. It is also for the collector who wants to keep their HK factory-correct while gaining a performance edge. Rare Breed builds these in the USA, and the fitment is tight enough to eliminate slop but not so tight that you fight the safety. If you have ever wished your MP5 trigger had more character and less travel, this is the upgrade you are looking for.

Shipping & FFL

This FRT-RD3 (AMBI) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K ships directly to your door. No FFL transfer is required for this component because it is classified as a firearm part, not a firearm receiver or complete weapon. However, you must comply with all federal, state, and local laws regarding trigger installation and use. Some jurisdictions restrict forced-reset trigger systems, so check your local regulations before ordering. We ship within two business days of payment confirmation, and tracking information is emailed as soon as the label prints. If you have questions about compatibility with your specific lower receiver, contact our team before purchase. Rare Breed triggers are precision parts, and proper installation ensures safe, reliable function in all three selector positions.