If it's related to bolt guns I'm sure lots of people (myself included obviously) will recommend Benchmark Barrels up in Arlington. They don't have a website, but you can call them at (360) 652-2594
Try Tom Ryder in Seattle. His company is SPR Industries LLC. Google him. He builds all my guns and has not disappointed me yet. Every bit of rifle that GAP and Nighthawk offers in terms of precision and accuracy.
Jesse and Travis are RBros Rifles. They are annoying as hell to shoot against, because they are both good shots and build very accurate rifles. Nice pistols, too.