I've saw www.AR15.com but I'm not I member yet to I thought I'd try here first.

Briman: Yes as hard as it is to believe, "off-list" lowers are legal. I can get .223 lowers all day, shipped right to my FFL. They are Stag, Vulcan, Superior, LAR, etc... To make the legal I just have to use the Prince 50 magazine lock, so no more detachable mag. But just turn a allen screw three times and it is detachable again for when I go out of state. There have been about 35,000 of these off-list guns built and only two people have gotten arrested. One got dropped before he made it to court, the other is in court right now because he pulled the rifle out and pointed at someone else.