This Nordic Components Barrel Clamp connects an extended magazine tube solidly to a shotgun's barrel, providing additional support for the tube against the added weight of additional shells enclosed within its elongated body, as well as helping to prevent the tube from being damaged and/or misaligned with the receiver if bumped, dropped or roughly handled during use. Designed to withstand the accelerated wear, tear and abuse encountered in action shooting competitions, the aluminum clamp is sized specifically for compatibility with a Nordic Components magazine tube, but will also work with any other magazine tube extension with an outside diameter of approximately 1.06". Holes on each side threaded 10-32 for accessories or the Nordic Tac Rail Picatinny section (sold separately). For 12 Gauge only. Notes: This barrel clamp is compatible for use 12 Gauge Shotguns equipped with a Nordic Component's magazine tube extension EXCEPT for those produced by Mossberg. The correct barrel c...