these are the ones the BATFE were pissy about? the ones they claim were 100% finished receivers that were "filled in" to 80% status...no jig necessary???
As I understand it, the ATF didn't like the ones that had two different colors of polymer. Basically, you'd remove the one color and what was left was a finished lower. The ATF asserted that the "receiver" color was produced first, "then filled in" with the second color. Ares says that the plug (the inner color) was produced first, then built up into the 80% blank.
If the ATF is correct, the receiver is illegal. If Ares can prove the process, then maybe not.
For now, though, Ares is selling polymer 80% blanks again, but they are now a single "solid" color.
Personally, I'm not a fan of polymer lowers (it's a prejudice--nothing based on personal experience), but their polymer lower that comes with its own 1-use jig is really, really tempting.