The FBI has released the first photos of the AR-15 rifle that Thomas Matthew Crooks used in his attempt to kill former President Donald Trump in Butler, Pennsylvania last month. The images show that Crooks — a 20-year-old gun nut — broke down the semi-automatic DPMS DR-15 rifle into two pieces and stowed it in a black SwissGear backpack as he made his way through the Butler, Pa. rally crowd. A closer look at the weapon reveals an approximately three-inch chunk missing from the gun’s buttstock, which could be where the police sniper’s bullet struck before the Secret Service sniper...