Shop › LBE AR MILSPEC BUFFER TUBE KIT BLK LBE AR MILSPEC BUFFER TUBE KIT BLK $59.99 LBE Unlimited Mil-Spec Buffer Tube Kit , Contains Buffer Tube, Castle Nut, Lock Plate, 6 Position, Fits AR-15, Black MILBUFKT Quantity: Add To Cart Added! LBE Unlimited Mil-Spec Buffer Tube Kit , Contains Buffer Tube, Castle Nut, Lock Plate, 6 Position, Fits AR-15, Black MILBUFKT