I found some old business cards with local guys.
Antioch Armory
712 W. 2ND ST.
Antioch
(925) 706-1442
Never been there but I heard some good things about them.
Bruce McLeod
Hollywood Exotic Arms
6600 Dublin Blvd.
Dublin
(925) 828-9568
Never been there, but I heard he was the AW king in Dublin a couple of years ago.
Sierra Gunsmith Services
3087 N. Main St.
Walnut Creek
(925) 939-3646
I had work done there 3-4 times, usually generally satisfied. One time they broke the front sight installing Trijicons on my HK USP (not Mike LaPointe), and then gave me a song and dance for 8 weeks trying to get a replacement. That incident soured me a little. I get the feeling they didn't have the right tools for the job but did it anyway and broke the front post.
Bill Riley in P Hill is a cool guy, but he's not an AW man. He's not really a semi-auto man either. He's old school. If you give him an AW, he'll send it off to his friend who's susposed to be a police armorer. His friend assembled an AR lower for me 3 years ago and it worked great. I gave Bill my S&W 4006 for a trigger job and after his partner looked at is for a couple weeks, they couldn't do anything with it. So, you know, I think he's a bolt and shotgun man.
If you go to Valley, stop by the barber shop next to Ace hardware (on the right as you face Ace, the hair place on the left is owned by Vietnamese woman) and have Cliff give you a haircut. He's a shooter and very pro-gun. And he's a good guy as well.