I may have a solution to your problem. There is a company called Caswell Plating that manufactures a product called "Stainless Steel Blackener". This product works wonders on stainless steel gas cylinders for the M1 Garand and the M1A, and gives a perfect black finish. The wesite address is the "www", "dot", "caswellplating", "dot", "com". I have never had success in posting web address, so the this should get you to their site. Their telephone number is 315-331-5141 and I would suggest that you call them to discuss what you plan to blue.
I hope this helps a little, and keep us posted if you contact the folks at Caswell, as I found they are very nice people to deal with.
Marvin
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