Add the Punisher Barrel Rail to your paintball gun barrel and you'll be able to mount a flashlight, laser sight, bipod and pretty much anything you can think of. The Punisher Barrel Rail comes with four different barrel adapters can be mounted on all barrel sizes, all barrel designs, all make and model of paintball markers, and all barrel models. It can be fitted to any paintball gun barrels on the market today. Made out of solid alloy.  Measures 1 7/8" in length.