If you're a terrorist, a guerrilla, or are aspiring toward either, The Armory might be your gun depot of choice. But for anyone not on the government's radar, 100-percent legal, open websites are all you need to plan an American massacre. This is a little scary.
The Bushmaster M4 is a 3-foot rifle capable of firing thirty 5.56×45mm NATO rounds, and used by spec ops forces throughout Afghanistan. It's a serious weapon. But in the Internet's darkest black market, it's all yours. Who needs a background check? Nobody.