About this product

FRT-RD3™ (SEF) Two-Stage · 3-Position · SEF Housing · HK MP5 / MP5K / SP5 / SP5K HK MP5 HK MP5K HK SP5 HK SP5K The FRT-RD3™ (SEF) delivers Rare Breed Triggers’ patented forced reset technology inside the iconic SEF (Safe/Semi/Full) housing — purpose-built for the HK MP5, MP5K, SP5, and SP5K . Three selectable positions — Safe, Two-Stage, and Forced Reset — in a classic

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

Overview

The FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger is a precision-engineered drop-in trigger system designed exclusively for HK MP5, MP5K, SP5, and SP5K platforms. Manufactured by Rare Breed, this trigger introduces a forced-reset mechanism that re-engages the sear automatically after each shot, enabling rapid follow-up fire without the need for full finger release. The three-position selector offers safe, semi-automatic, and forced-reset modes, giving the operator direct control over firing cadence. This FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is built to original HK SEF trigger pack dimensions, ensuring a seamless fit without permanent modifications to the host weapon.

Features & Specs

The FRT-RD3™ utilizes a two-stage trigger pull in forced-reset mode, with a defined take-up wall followed by a crisp break. The reset cycle is mechanically forced, returning the trigger forward immediately after firing, which reduces split times significantly. All components are machined from billet steel and hardcoat anodized for durability under sustained use.

• Two-stage trigger action: distinct first-stage take-up with a short, defined second-stage break; consistent pull weight across all three positions
• Three-position selector: safe (rear), semi-automatic (middle), forced-reset (forward); clear tactile and audible detents for each position
• Drop-in design: fits HK MP5, MP5K, SP5, and SP5K SEF trigger housings; no permanent modification, filing, or gunsmith fitting required; includes all necessary springs and pins

Who It’s For

This trigger is intended for serious shooters who demand consistent performance from their roller-delayed blowback platform. Competition shooters in USPSA, 3-Gun, or outlaw rifle matches will benefit from the reduced reset travel in forced-reset mode, allowing faster split times without altering the weapon’s manual of arms. Law enforcement and qualified armorers who require a reliable, repeatable trigger system for training or duty use will find the FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K suited to high-round-count environments. It is also appropriate for experienced civilian shooters who understand the mechanics of forced-reset triggers and operate them responsibly on the range. This product is not recommended for shooters unfamiliar with forced-reset trigger dynamics or for use in any scenario requiring a standard single-action-only trigger.

• Competition shooters: reduced split times without compromising trigger control; consistent pull weight shot-to-shot in forced-reset mode
• Armorers and trainers: drop-in installation with standard SEF components; no additional training required for safe operation in semi-automatic mode
• Civilian shooters: three-position selector allows immediate return to semi-automatic; all safety features of the original HK trigger pack are retained

Shipping & FFL

This FRT-RD3™ (SEF) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is classified as a firearm component and does not require a Federal Firearms License (FFL) for shipment to your address. All orders are processed with standard ground shipping within the continental United States. Some states or local jurisdictions may impose restrictions on the possession or use of forced-reset triggers. It is the buyer’s sole responsibility to verify that this product is legal to own and use in their specific location before placing an order. By purchasing this item, you confirm that you are at least 18 years of age, are not prohibited from owning firearms or firearm components under federal or state law, and will comply with all applicable laws regarding installation and use.

• No FFL required for shipment to residential addresses within the U.S. (excluding restricted states and localities)
• Buyer must verify local legality regarding forced-reset triggers; Rare Breed and this retailer assume no liability for non-compliance
• All sales are final; returns accepted only for manufacturer defects within 30 days of receipt