[hga]

The Ghost Gunner drills/machines the right holes in an 80% receiver, it doesn't start with a 0% receiver: http://www.80percentarms.com/products/0-billet-ar-15-lower-r...

But it's not very difficult to start at that level: http://motherboard.vice.com/read/the-cartel-gunsmiths $25K for a pro CNC machine isn't much in the scheme of things.

[Aelinsaar]

For a cartel? It's nothing. For most people who want a particular gun, and don't intend to monetize the purchase, never mind the time taken to learn how to work and maintain it? That's a hell of a thing to be honest.

[hga]

The real barrier is the knowledge, you don't need a relatively new CNC machine like that if you're just going to make a few for yourself. And old but high quality non-CNC machines are sufficient for that, and require a somewhat different set of skills.

But that's not the scenario I'm thinking about, nor is it relevant as of now in a country which has more than doubled its gun production since Obama was elected, with > 100 million being sold in that period (obviously not all those were new).

[Aelinsaar]

If the barrier to a decent firearm is knowledge of how to work and maintain and older CNC, that seems like a pretty excellent means of limiting firearms. "You're free to have what you can make from scratch, up to a certain point."