Rich,
You could give GunBlack
http://www.gunblack.com/ a call. They're close to me, in Interlaken. The owner's son, Steve, is quality-conscious, really seems to know his stuff/processes, and is a nice guy, to boot. And I've been able to pay with a couple of bottles of La Fin du Monde, or similar, each time. You can save a lot if whatever you send is stripped down and prepped--they will degrease and acid dip, then hot blue. Great quality finish!
I've had them blue the barrel sleeve spacer for my Luger-to-.22 conversion kit, and a half dozen parts for my Thompson's soon-to-be removable butt stock. (I'm having the lower frame milled to receive an adapter plate, which my machinist is also making [He can probably make more adapters, once the recipe is established. I'm pretty sure John S. wants one for his Tommy project.])