GroveTech Two-Piece Shotgun Barrel Band Swivel .775 - .825. No swivel stud on your shotgun forearm? Want to mount a sling on your lever action rifle's magazine tube? GroveTech's GT Barrel Band Swivel Sets are your answer. With a GT Sling Swivel in hand, you'll immediately recognize its quality. Close tolerance machining assures a snug, solid fit with a minimum of noise.