Here is what the description says: “Battle Mug starts as a 13.5 pound solid block of 6061 T6 billet aluminium before it enters a state of the art CNC facility which produces specialized parts and equipment for the U.S. Department of Defense, major weapons manufacturers, NASA…etc. Built to military specifications, Battle Mug features a M1913 rail interface system which allows the operator to mount a standard issue M4 carry handle, tactical light, laser device…” Each unit costs $279.