TASO 1 INCH Barrel Muzzle Brake Paintball. Condition is "New". Shipped with USPS First Class. This muzzle brake fits over any barrel that is 1 inch in diameter. It has 2 set screws that clamp onto the barrel so if you dont want to mar it put a piece of electrical tape on the end then tighten it down. I know it fits the Automag stock bull barrels. If you have any questions please feel free to ask, thank you.