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MIAMI, FL - DECEMBER 18: In this photo illustration, a Rock River Arms AR-15 rifle is seen with ammunition on December 18, 2012 in Miami, Florida. The weapon is similar in style to the Bushmaster AR-15 rifle that was used during a massacre at an elementary school in Newtown, Connecticut. Firearm sales have surged recently as speculation of stricter gun laws and a re-instatement of the assault weapons ban following the mass shooting. (Photo illustration by Joe Raedle/Getty Images)
MIAMI, FL - DECEMBER 18: In this photo illustration, a Rock River Arms AR-15 rifle is seen with ammunition on December 18, 2012 in Miami, Florida. The weapon is similar in style to the Bushmaster AR-15 rifle that was used during a massacre at an elementary school in Newtown, Connecticut. Firearm sales have surged recently as speculation of stricter gun laws and a re-instatement of the assault weapons ban following the mass shooting. (Photo illustration by Joe Raedle/Getty Images)

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What qualifies as an assault weapon? CNN's Joe Johns provides the details and discusses what a potential ban would mean.