Drawing on his unmatched firearms knowledge and combat experience, Chris Kyle tells the story of America through ten guns: the American long rifle, Spencer repeater, Colt .45 revolver, Winchester rifle, Springfield 1903 rifle, Thompson sub-machine gun, 1911 pistol, M1 Garand, .38 Special police revolver, and the M-16 rifle platform Kyle himself used as a SEAL.

In American Gun he uses them to revisit thrilling turning points in American history, including the single sniper shot that turned the tide of the Revolutionary War, the firearms designs that proved decisive at Gettysburg, the "gun that won the West," and the weapons that gave U.S. soldiers an edge in the world wars and beyond. This is also the story of how firearms innovation, creativity, and industrial genius has constantly pushed American history-and power-forward.