[ChuckMcM]

Well you can make a cannon as easily, but the BATF has been aggressive at pursuing people who discuss gun making, the more sophisticated (like 3D printing them) the more aggressive the pursuit. A project for recreating a black powder musket? Not a lot of heat. A project for a repeating launcher that lobs soviet era grenades while pulling the pins on exit, very aggressive pursuit.

[anth_anm]

It's legal to build your own guns.

3d printing isn't that sophisticated considering you can build a working AR with off the shelf parts, a drill press, and a hand router.

[dsfyu404ed]

There's plans for an 7.62 Tokarev pistol based on the AK style action that have been floating around the internet since forever. No drill press or router required. Just a drill, file and some misc hand tools. The AK style action lends itself well to that kind of ghetto fabrication because it's a stamped receiver and machining tolerances can be described as "optional"

[Rebelgecko]

It's legal to build your own guns but people who disseminate info for how to do so have got in all kinds of legal trouble. Defense Distributed, codeisfreespeech.com, etc