Build a rifle. No 3-D printer required.

Found at Western Rifle Shooters Association:

 All you need is a barrel and bolt and wood furniture.

Tapco has all these parts, including adjustable stocks.

From Mother Jones:



Of course, being a good lefty liberal idiot, the guy destroyed his creation afterwards, lest he be tempted to become a real American.

Poor man's slugs

Wax and birdshot -

Do it yourself AR15 lower

From bar stock. Borepatch has the skinny.

Anyone with a small drill/mill can now make the registered part of an AR-15 in his garage. All the rest of the parts are unregulated and available to anyone, anywhere.