Muzzle Compensator ST4 9mm PCC 1/2-28 by Thor Armory × Armacon

The ST4 Muzzle Compensator 9mm PCC 1/2-28 is a collaborative design by Thor Armory and Armacon, engineered specifically for AR-platform pistol caliber sport carbines chambered in 9×19 mm with a 1/2-28" threaded muzzle. It effectively reduces muzzle rise and improves overall platform control during rapid, dynamic shooting — a meaningful advantage in competitive IPSC and PCC disciplines.

Key Features

• Three-port classic compensator design — ports are progressively smaller toward the muzzle end for optimized gas redirection and muzzle rise reduction.
• Correct rotational orientation is secured via a recessed hex set screw — ensures consistent positioning without secondary locking components.
• Installs with a single hex key — quick and straightforward fitment.
• Co-developed with Thor Armory for a design refined specifically for 9mm PCC platforms.
• Laser-engraved marking for permanent, clear identification.

Construction & Materials

Machined from 40Kh alloy steel with a carbonitrided surface treatment for outstanding hardness, wear resistance, and corrosion protection — built to withstand intensive range use over the long term.

Specifications

• Caliber: 9×19 mm
• Thread: 1/2-28"
• Design: 3-port compensator
• Material: 40Kh steel, carbonitrided

What's Included

Supplied in a zip-lock bag. Installation requires one hex key (not included).

Compatibility

Designed for AR-platform sport carbines chambered in 9mm with a standard 1/2-28" threaded muzzle, including AR-9 and PCC-format platforms.

Recommended Use

Purpose-built for IPSC, PCC competition, and dynamic sport shooting where reduced muzzle rise directly translates to faster follow-up shots and improved stage times.

Original Armacon × Thor Armory product. Distributed worldwide by Bazalet.