"The four weapons that authorities say were used in the massacre at a Colorado theater showing of the latest Batman movie included a popular semiautomatic rifle, a .223-caliber assault-style rifle with a 100-round drum magazine. The suspect also had two .40-caliber Glock handguns and a 12-gauge Remington Model 870 pump shotgun. In the past 60 days, police said, Holmes bought more than 6,000 rounds of ammunition, at gun shops and over the Internet, including: * 3,000 rounds of .223-caliber ammunition for the rifle. It was described as an AR-15-type weapon built by Smith and Wesson. * 3,000 rounds of .40-caliber ammunition for the Glock handguns. * 300 rounds for the shotgun.... Officials told NBC News that all four were purchased legally, beginning in May, from two national chain stores: Gander Mountain Guns and Bass Pro Shops."