Integrated Barrel Rail (IBR)is being replaced with the Punisher Barrel Rail. Add this barrel rail to your paintball gun barrel and you will be able to mount flashlight, laser sight, and pretty much anything you can think of. This 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 in the markettoday. Made out of solid alloy .