Heresy Design 16.3in 5.56 AUG Conversion Kit Black. 3'' 5.56 NATO Conversion Kit is the ultimate upgrade for Steyr AUG A3 M1 owners looking to unlock their firearms full potential. Engineered for suppressor use this conversion kit allows you to seamlessly switch calibers and gas settings for suppressed use with minimal gas blowback. At the core of the Heresy Design 5.56 NATO Conversion Kit is a 16.3'' barrel equipped with a restrictive 3-setting adjustable gas system. The restrictive gas system ensures a quiet shooting experience by eliminating piston pop and reducing gas block area venting noise. Installation is quick and straightforward requiring no modifications to your firearm. In under 60 seconds you are ready to hit the range. Specifications for Heresy Design 16.3in 5.56 AUG Conversion Kit: Manufacturer: Heresy Design Color: Black Gun Make: Steyr Gun Model: Steyr AUG Caliber: 5.56x45mm NATO Magazine Capacity: 0 Round Features of Heresy Design 16.3in 5.56 AUG Conversion Kit 1/2x28 threaded barrel with upgraded gas piston system Seamless install without any modifications needed 3-setting easy-to-adjust gas system Isonite coated wear parts Anodized Aluminum quad rails Limited lifetime warranty Package Contents: Heresy Design 16.3in 5.56 AUG Conversion Kit Manual Sticker What firearm models does the manufacturer say Heresy Design 16.3in 5.56 AUG Conversion Kit is compatible with? The manufacturer suggests that Heresy Design 16.3in 5.56 AUG Conversion Kit is compatible with Steyr AUGHeresy Design HB16A: 16.3in 5.56 AUG Conversion Kit Black