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In case anyone is still interested . . .

As someone else said, a soak in vinegar will remove the bluing. And while ya can't make a non-stainless gun into stainless, what I did works fine for me. After removing the bluing I bead-blasted the gun - then cleaned it completely with a Harbor Freight ultrasonic and Lyman's Turbo Sonic Steel and Gun Parts cleaner - rinsed it off in plain water, and then used non-chlorinated carb cleaner on everything. Finally, I used a Harbor Freight ultrasonic with Lymans Turbo Sonic Ultrasonic Gun Lube. The lube product dries to a dry-to-the-touch coating that lubricates AND PROTECTS the gun - my bead-blasted guns haven't rusted at all since I used this process several years ago. My pistols are kept inside the house, and when I shoot them, I clean them off - but the metal hasn't shown any visible rust since I processed them. I probably wouldn't blast an expensive gun, but for the Norinco 213 9mm and FEG Hi-Power knock off, the process worked great, for me.