You might make an inquiry to Olypenarms.
http://olypenarms.com/
There's also to American Pistol Smith members for WA: https://americanpistolsmithsguild.com/APGMembersByLocation/Washington
BarSto used to be THE name in barrels. Nowlin, Kart, Jarvis, Fusion, and a couple others also have decent reputations. These days, the fitting/crowning, and all the other 'magic' are probably at least as important as the barrel brand.
Good luck,
Boss