WASHINGTON — The alleged Colorado gunman legally purchased four guns, including a military-style assault rifle and a special magazine that meant he could fire off 50 to 60 deadly bullets a minute. Over eight weeks he stocked up over the Internet on 6,300 rounds of ammunition: 3,000 for his .233 semi-automatic AR-15 rifle, another 3,000 for his two .22 Glocks, and 300 cartridges for his pump-action shotgun. When the gun dealers performed the minimal background checks... (GunPolicy.org)