Description

FRT-RD3™ (SEF) 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 the soul of the gun. The stock packs are fine for safe handling, but they leave speed on the table. That is where the FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K steps in. Rare Breed engineered this drop-in unit to deliver a crisp two-stage pull with a mechanical forced-reset that lets you stay on target without fighting the trigger shoe. It is a direct replacement for SEF housings, so you get three positions: safe, semi, and that third position where the forced reset lives. No guesswork, no filing, just a clean install and a fundamentally faster shooting experience.

Overview

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is built around Rare Breed’s proven forced-reset geometry, adapted specifically for the HK roller-delayed action. Unlike standard triggers that rely entirely on your finger to reset the sear, this system uses the bolt’s return energy to push the trigger forward. The result is a short, predictable reset that stays consistent through rapid strings. It fits standard SEF trigger housings without modification, so you keep your original safety detents and selector. This is not a gimmick; it is a mechanical advantage for shooters who want to maximize split times while maintaining positive control over each round.

Features & Specs

Every component in this trigger is machined from billet steel and heat-treated for durability. The two-stage pull breaks clean at roughly 4.5 pounds, with a distinct wall before the sear releases. The forced-reset feature engages only in the third selector position, so your semi-auto function remains unchanged. Below are the key specs and what they mean at the range.

• Drop-in design for HK SEF housings: fits MP5, MP5K, SP5, and SP5K without permanent modification.
• Two-stage pull with mechanical forced reset: first stage takes up slack, second stage breaks crisp, and the bolt resets the trigger for you.
• Three-position selector compatibility: safe, semi, and forced-reset mode all function from a standard SEF lower.

Rare Breed backs this unit with their standard manufacturing warranty. The trigger group is assembled and tested before shipping, so you can install it and verify function immediately. No special tools are required beyond a punch to push out the trigger housing pins.

Who It’s For

This trigger is designed for competitive shooters, law enforcement professionals, and HK enthusiasts who have already mastered the basics and want to push their platform further. If you run drills that require fast follow-up shots on steel or paper, the forced reset reduces the distance your finger has to travel between shots. It also suits shooters who prefer the tactile feedback of a two-stage trigger but want the speed advantage of a short reset. Because it uses a mechanical reset rather than a binary or full-auto function, it stays compliant with federal regulations while giving you a legitimate performance edge. If you own an SP5 or SP5K and want to upgrade the trigger without changing the look or feel of your SEF lower, this is the direct path.

Shipping & FFL

This item ships directly to your doorstep. No FFL transfer is required because it is a trigger assembly, not a firearm. Federal law classifies this as a firearm component, not a receiver or complete weapon, so standard shipping restrictions apply. We ship to all states where the trigger is legal, including California, provided the buyer is not prohibited from owning firearm parts. Check your local laws regarding forced-reset triggers before ordering. Rare Breed and our retail team recommend reviewing California Penal Code sections related to trigger mechanisms to ensure compliance. By purchasing this product, you confirm you are legally allowed to possess it under state and federal law. We do not accept returns on installed triggers; inspect the unit upon arrival and test function in a safe direction before live fire.