The Battle Mug starts out as a 13.5 pound solid block of 6061 T6 billet aluminum before it enters a state of the art CNC facility in Huntsville, Alabama. This facility produces specialized parts and equipment for the U.S. Department of Defense, major weapons manufacturers, NASA, and a host of other companies working at the U.S. Rocket and Space Center. Built to military specifications, Battle Mug features a M1913 rail interface system which allows you to mount a tactical light, laser device, holographic sight (AKA beer goggles) or even a bayonet for close quarters, high risk operations. A standard issue M4 carry handle is included.