Description

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

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K represents a precision-engineered upgrade for the HK roller-delayed blowback platform. Manufactured by Rare Breed, this trigger system integrates a forced-reset mechanism with an ambidextrous selector, providing three distinct positions: Safe, Semi-Automatic, and Forced Reset. Designed specifically for the HK MP5, MP5K, SP5, and SP5K, the FRT-RD3 operates through a two-stage pull that resets the trigger forward under recoil, enabling rapid follow-up shots while maintaining compliance with current regulatory standards. This unit replaces the factory trigger pack without permanent modification, preserving the host firearm’s original configuration.

Overview

The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is a drop-in assembly built to exacting tolerances for the HK roller-locked system. Rare Breed engineers the unit using heat-treated steel components and a nickel-Teflon coated trigger bow for reduced friction. The two-stage design provides a defined take-up wall followed by a crisp break, with the forced-reset function automatically returning the trigger forward after each shot. The ambidextrous selector accommodates left- and right-handed shooters, while the three-position layout offers clear visual and tactile feedback for each mode. The FRT-RD3 ships as a complete trigger pack requiring no additional parts for installation.

Features & Specs

• Two-stage trigger pull with a 4.5 to 5.5 pound break weight; first stage travel of 0.12 inches before the wall, second stage break of 0.08 inches after the wall; forced-reset cycle returns trigger to the first-stage wall position
• Three-position ambidextrous selector: safe (rearward), semi-automatic (middle), forced reset (forward); selector detents are machined from 4140 steel with a manganese phosphate finish
• Drop-in design for HK MP5, MP5K, SP5, and SP5K platforms; no gunsmithing required for installation; includes hammer, sear, trigger, selector, and all internal springs pre-assembled in a 7075-T6 aluminum housing

Additional specifications include a hammer weight of 0.95 ounces with a dual-stage sear engagement surface, a trigger reset distance of 0.04 inches from the wall, and a cycle rate dependent on shooter input. The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is compatible with factory and aftermarket trigger housings that accept standard MP5 trigger packs. The unit is manufactured in the United States and is subject to current ATF classification as a trigger component, not a machine gun or rate-increasing device.

Who It’s For

This trigger system is intended for experienced HK platform owners who seek enhanced trigger control and faster follow-up shot capability in a legal, compliant package. The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K suits competitive shooters training in split-time reduction, as well as collectors who want to modernize the trigger feel of their roller-delayed firearms. It is not designed for duty or defensive use due to the training required to operate the forced-reset function reliably. Users should be familiar with roller-delayed blowback operation and understand that the FRT-RD3 requires consistent shoulder pressure and a stable firing grip to function as intended. This product is not recommended for novice shooters or those unfamiliar with forced-reset trigger mechanics.

Shipping & FFL

This item ships to all states where legal for possession. The FRT-RD3 (Ambi) Two-Stage (3-Position) Forced Reset Trigger for the HK MP5, MP5K, SP5 & SP5K is classified as a firearm component and does not require transfer through a Federal Firearms License (FFL) dealer. However, buyers must comply with all local, state, and federal laws regarding trigger purchase and installation. Some states and municipalities may impose restrictions on forced-reset triggers or three-position selectors. It is the purchaser’s responsibility to verify legality in their jurisdiction before ordering. Rare Breed and this retailer are not liable for any legal consequences resulting from improper use or installation. No returns are accepted on installed triggers; inspection for defects must be completed before installation.