SGT, READ his post. He already has a 16" PRE-BAN RIFLE, and is looking for advice on building up a post-ban.
SF, I'd go with a bull-barrel flat-top precision gun. The standard 20" is not different enough for a second rec. Get a good scope and some good 75gr loads and shoot WAY out there. You'll also want a better trigger and a nice stock. Have fun.....