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FILE - In this June 25, 2010, file photo Britain's Prince Harry fires a Colt M4 assault riffle on a United States Military Academy range in West Point, N.Y.  The Defense Department is searching for the successor to the M4 combat rifle and gun makers are loading with lobbyists to win the work. Colt Defense of West Hartford, Conn., had an exclusive deal to provide M4s to the U.S. military and didnt need a hired gun looking out for its interests in Washington. (AP Photo/Chad Rachman, Pool, File)
FILE - In this June 25, 2010, file photo Britain's Prince Harry fires a Colt M4 assault riffle on a United States Military Academy range in West Point, N.Y.  The Defense Department is searching for the successor to the M4 combat rifle and gun makers are loading with lobbyists to win the work. Colt Defense of West Hartford, Conn., had an exclusive deal to provide M4s to the U.S. military and didnt need a hired gun looking out for its interests in Washington. (AP Photo/Chad Rachman, Pool, File)

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    History of the modern assault-style rifle

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History of the modern assault-style rifle

Since 2004, assault-style rifles have become widely available in retail stores and gun shows across the U.S. for prices ranging from $800 to $3,000.

History of the modern assault-style rifle

Since 2004, assault-style rifles have become widely available in retail stores and gun shows across the U.S. for prices ranging from $800 to $3,000.