Steyr Arms AUG 20" 1/2x28 Mud Barrel 1255010666 is engineered to fit all models of the Steyr AUG, from the A1 to the new AUG A3 M1. This barrel is crafted from high-quality Chrome-Moly 4150 steel with a durable mud-colored coating. It features a 1:9 twist rate and a 1/2" x 28 barrel thread pitch, along with a tulip-style flash hider to reduce muzzle flash. The mud-colored foregrip comes pre-installed, providing a secure and comfortable grip. Perfect for enhancing the performance and reliability of your Steyr AUG, this barrel is an essential upgrade for any AUG enthusiast.