http://www.lewismachine.net/catalog.php
Are you looking for a unit without a flash suppressor I take it? I'm not a lawyer and I don;t play one on TV, but here in PRM, you can buy an upper in any configuration you want, but add it to a rifle and it's bad juju. Someone up here just bought an LMT with a flash suppressor and promptly took it to a gunsmith to have a brake permanently attached. No bubbles - no toubles and the nice folks at LMT may just do it for you..Good luck.