Who do we know for a quality work on AR assembly from customer provided parts? I am in a pre-contemplation stage of getting myself a gaming AR upper built around a relatively short barrel. Thinking a sleek receiver, 13.7-13.9 midlength barrel and a giant pinned and welded gaming comp. Maybe Smoke Composites rail. I know some who build great but they often prefer from their own parts. If I went through with it, I'd need somebody who'd be ok with just building from parts but will be competent enough to tell me if I'm making bad choices.