It didn't take much effort for the accused gunman in Tucson's Jan. 8 mass shooting to buy a semiautomatic handgun and ammunition - quick trips to the Sportsman's Warehouse and Walmart near his home. It didn't take long - 15 seconds - for him to shoot 19 people, killing six, when he fired 31 rounds using a high-capacity magazine. That's roughly double the standard number for the Glock pistol he used. And even if police could go back in time, they wouldn't have been... (GunPolicy.org)