From Reason:

Around the world, governments attempt to limit subjects’ legal access to weapons—ostensibly to keep the peace, but in reality often done to minimize challenges to government power. And, around the world, those subjects defy such restrictions, often going so far as to manufacture weapons outside official channels. In fact, DIY firearms ranging in sophistication from muskets to grenade launchers exist in the millions across the planet, according to a new report that should (but won’t) finally demonstrate to government officials the futility of efforts to disarm people who insist on being free.