I’m pretty much of the belief that sending a firearm back to the manufacturer is the best option, but I consider a Turnbull restoration a step up from that if I was buying a refinished piece.
Hard to get into blueing with the EPA these days. Talked to a gun shop a while back and they opted not to do blueing because the EPA wanted tens of thousands of dollars because there was a ditch about 200 yards away from the shop.