The Heresy Design™ 16.1″ 9MM Conversion Kit is the ultimate upgrade for Steyr® AUG® A3 M1 owners looking for caliber conversions. This kit allows you to convert your AUG® to a 9mm configuration in under 90 seconds, all without any permanent modifications. The barrel is precision-machined from 41V50 steel with an Isonite finish and features a 1/2×28 thread pitch paired with a tri-lug suppressor adapter. The kit ships complete with the 16.1″ barrel and carrier group and weighs 3 lbs. 2 oz.
With a focus on minimal gas blowback and suppressor compatibility, it’s the ideal choice for tactical shooters, range enthusiasts, and those seeking a quieter, more comfortable shooting experience. Designed for compatibility with the Steyr® AUG® A3 M1 with Standard Stock in black finish, this conversion kit delivers the versatility serious shooters demand. The kit is engineered for easy installation, minimal recoil, and maximum performance—whether you’re exploring a new caliber or adding suppressor capability to your platform.
