A tube and ring assembly is provided for use with a shotgun barrel including a cylindrical tube, which may be a conventional choke tube or a carrier platform, with a first externally threaded portion at one end for threadingly engaging an internal thread in the shotgun barrel. A second externally threaded portion is provided on the tube which will remain exposed beyond the muzzle end of the shotgun barrel when the tube is fully threaded into engagement with the shotgun barrel. An internally threaded ring is also provided which is sized to be threadingly carried on an outside of the tube and to engage the second externally threaded portion of the tube such that the ring can be threaded onto the tube until it abuttingly engages the muzzle end of the shotgun barrel.
