Re: Billet Lowers VS regular lowers
billet will do nothing for you that a forged, MilSpec lower can't. however, as stated, they are more likely to have the ambi release built in, as well as having the trigger guard also built in. depending on who makes the particular part, they can have tension screws for a good tight upper-to-lower fitment.
and, yeah, they really do look cool. they're supposed to be stronger, so i hear claims, but forging is way tough.
the thing i like about the billet parts the most, though, is that you can typically get them with a matched upper receiver. that'd be real nice for a good solid build.
oh, and John W, bolts and BCGs are getting VERY hard to find. pre-election scare... gotta love it!