aging
Craig you totally missed the point.
Yes I know it takes more than just a bit of vinegar or mustard.
But that is a starting point.
Also depends on how extreme you want to go.
A good rub down with either will remove the bluing gradually to the amount of wear you want.
Normal day to day use, and just using it, will add the dings and the scratches.
But most seem to want to keep this tool (and it is a tool) pristine as it came out of the box.
Even a fully professionally blued gun will rust. If it wouldn't, be no reason to clean and oil it.
Thus after you have removed the bluing to your satisfaction routine cleaning and oiling will eliminate the rust, and you can concern yourself with just shooting and enjoying the dang thing.
But I see no reason to pay roughly $60 to have a factory make a fake for you.
When a $3 bottle of vinegar and some one on one time will achieve the same look, and the satisfaction you did it yourself (which was the point).