This is the Rob Allen Railgun CLOSED Muzzle for Spearfishing Spearguns Features: Significantly smaller in profile than conventional muzzles Easy to maneuver as the drag has been dramatically reduced Internal spigot and outer skirt for additional strength Rob Allen glass reinforced nylon muzzle is made for use with one band. The integrated band elevating design increases accuracy by reducing muzzle jump, and maximize the power by redirecting the force 100% forward. The entire muzzle is constructed from 30% glass reinforced nylon with an internal spigot and outer skirt for additional strength. The skirt also reduces stress concentration when fitted to carbon barrels.