Engineered to perfection and built for performance, the Heresy DesignA(R) 16" 5.56 AUGA(R) Conversion Kit was designed to be compatible with the SteyrA(R) AUGA(R) A3M1. Featuring a 3-setting adjustable gas system, this quick change barrel system allows AUGA(R) owners to shoot suppressed with minimal gas blowback. Ships with barrel assembly. FEATURES 1/2x28 Threaded Barrel Compatible with Standard and NATO stocks Easy Install without Modification Upgraded Gas Piston System Suppressor Ready 3-Setting Adjustable Gas System Anodized Aluminum Quad Rails with Heat Isolators Isonite coated wear parts Limited Lifetime Warranty Mfg: Heresy Design Inc.