Multiple liberal news outlets use a false narrative of Washington Naval Yard shooter, Aaron Alexis, used an AR-15 in his attacks. Piers Morgan, the New York Daily News, and CNN, among a host of others having been playing up the AR-15 angle in an effort to revive their gun banning laws.
Reliable sources have reported that Alexis had a shotgun and two pistols. it is believed he brought the shotgun and removed the two pistols from his victims. The real question is how could someone with a long history of mental problems get access to such a secure area. That is the same question people mare asking about Nidal Malik Hasan, the Fort Hood shooter.