Viking Armament - AR15/M4 Buffer Tube with Castle Nut

  • Sale
  • $ 19.95
  • Regular price $ 21.95

M4-style receiver extension tube has six precision-machined notches on the underside for maximum flexibility in setting length-of-pull with adjustable buttstocks. Lets you install a mil-spec stock on a civilian carbine or refit a rifle with an A2-style fixed buttstock with an adjustable M4 stock. Comes with the castle nut

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