You're not bulletproof...

Asian Khyber Pass?

Filipino gunsmiths in the town of Danao make handmade replicas of just about any weapon they can. Much like the legendary Khyber Pass, most of the guns are made out of scrap metal but are usually near exact copies. That doesn’t necessarily mean they are safe to shoot since quality will differ from each individual smith.

As expected, some of these guns end up going to the blackmarket run by various Asian organized crime groups such as the Triad and Yakuza.

Source