"If you pick up a Kalashnikov and you've been doing this for a while, 99% of the time you can tell where it was manufactured, what the model was, and which country it originated in. On the left hand side, you have a factory code and a serial number, and then you have associated marks where the safety catch is." James Bevan, 38, spends his life counting the world's illegal weapons. The former UN weapons inspector runs the world's most comprehensive map tracking the flow... (GunPolicy.org)