RON L here = SERESURPLUS
Well the question is really yes, It's not really parkerizing it, but I've seen a company that Brownells sold some sort of Soulution that you could color Stainless steel parts black! Not sure if it would work for the entire gun, but don't see why not? It would be a lot of work and would require you to take the gun down to it's smallest part and after color, re-assembly, sounds not so bad, but it can be a whole lot of work more? You can ask the Brownell folks about it?