[Bloody Sam Roberts]

Just print off a lower receiver for an AR-15 and you are good to go.

Already been done. It lasted for six rounds.

[jim_trent]

> It lasted for six rounds.

Thanks for the information. I was thinking about a lower that I saw in a video that was machined out of a block of high strength plastic of some sort. It lasted longer, but has not yet replaced aluminum. However, I am absolutely sure the problems will be worked out and it will be practical in the not-so-distant future.

I am also absolutely sure that the gun banners will jump on this and find some way to make it illegal. The BATF is never going to allow someone to walk into a Staples with a CD, download it into their 3-D copier, and walk out with a functional lower receiver. They have been harassing the 80% aluminum receiver suppliers for years.