Comment: Some more pertinent links:

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Some more pertinent links:

DISCLAIMER: This is NOT a legal advice, but from all publicly available info ATF has ruled several times that ALL private manufacture of NON-NFA (SBR, Suppressors, etc.) items are legal, for PRIVATE personal use. You cannot sell it, but for private use, it's perfectly legal, as far as currently available info suggests.

Even IF so, use at your own peril; among the R3VOL choir this should go without saying, but obviously the whole submitting to statist 'laws' issue aside: you assume full responsibility for manufacturing, liability resulting from it, and the use of it at any stages to prototype as well as the eventual 'final product.'

Ares Armor is a CALIFORNIA vet-owned company; if it's legal in California, it's legal in 49 other states. (I would assume, again check/verify all local 'laws,' use info at your own risk, and you assume full responsibility.)
Legally Make your own Gun
Rudius 80% 1911 Sneak Peak

If you want to know what the tolerances and stress specs, or simply what a complete polymer AR lower looks like for reference and/or comparison, check out these two leading mfg. of polymer AR receivers, the new post-ATF-raid-selloff-Calvary Arms:

and New Frontier Armory, out of LV, NV:

Once you have the lower, the rest, as with all AR, you can purchase commercially available components, at any infinite number of available online vendors, like

Also, if you're worried about the typical direct impingement gas system of AR 'melting' your lower, while a bit boutique, there are plenty of piston kits and uppers that won't blow gas back down into the lower receiver. Problem solved!

Or, if you actually want to run a gun, that will last practically forever, and will go bang, w/almost every press of the trigger?

Screw all that! Build your own AK from sheet blanks, 100% legally!

Predictions in due Time...

"Let it not be said that no one cared, that no one objected once it's realized that our liberties and wealth are in jeopardy." - Dr. Ronald Ernest Paul