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
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.
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Gun violence in America 11 videos
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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TINLEY PARK, IL - OCTOBER 18: Pistols are offered for sale at Freddie Bear Sports on October 18, 2012 in Tinley Park, Illinois. Facing a $267.5 million fiscal 2013 budget gap, Cook County, which includes the City of Chicago and suburbs, has proposed a tax of 5 cents per bullet and $25 on each firearm sold at gun and sporting goods stores in the county. Fred Lutger, who has owned Freddie Bear Sports for 35 years, is concerned with the impact the tax will have on his store which is located about 2 miles inside the Cook County line. (Photo by Scott Olson/Getty Images)
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