Shop › ARMASPEC CARB BFF TUBE KIT W/ EP/CN ARMASPEC CARB BFF TUBE KIT W/ EP/CN $35.09 Armaspec Carbine Buffer Tube Kit, Includes End Plate and Castle Nut, AR-15, Anodized Finish, Black ARM621-C Quantity: Add To Cart Added! Armaspec Carbine Buffer Tube Kit, Includes End Plate and Castle Nut, AR-15, Anodized Finish, Black ARM621-C