"The semiautomatic rifle used in the LAX shooting rampage Friday was purchased at a Van Nuys gun store and could fit into the bag the alleged gunman brought to the airport, a federal law enforcement source told The Times. The source said the weapon was a Smith and Wesson M&P 15, 5.56-millimeter and .223-caliber, which was purchased at the Target Range Gun Store, 16140 Cohasset St., Van Nuys."