Five years before he was shot to death in the failed terrorist attack in Garland, Texas, Nadir Soofi walked into a suburban Phoenix gun shop to buy a 9-millimeter pistol.At the time, Lone Wolf Trading Co. was known among gun smugglers for selling illegal firearms. And with Soofi's history of misdemeanor drug and assault charges, there was a chance his purchase might raise red flags in the federal screening process.Inside the store, he fudged some facts on the form required of would-be gun buyers.What Soofi could not have known was that Lone Wolf was at the center of a federal...