SIMI VALLEY, California — Sen. Rand Paul (R-KY) is aiming his guns at GOP frontrunner billionaire Donald Trump ahead of the second presidential debate. While shooting a rifle, shotgun and pistol at Taran Tactical Innovations here, down the street from the Ronald Reagan Presidential Library, Paul told reporters he’s gunning for Trump. Paul fired at targets including a big stack of paper file boxes labeled the “IRS Tax Code” and at a bulletproof vest.