"The semiautomatic rifle used in the shooting was purchased at a Van Nuys gun store and could fit into the bag the 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, caliber .556, which was purchased at the Target Range Gun Store, 16140 Cohasset St., Van Nuys. The source said the weapon is “collapsible” to be assembled later. But it could “easily fit ready to fire” into the luggage bag the alleged shooter brought into the airport, added the source, who spoke on condition of anonymity because the case is ongoing."