What kind of blueing did you have done and what kind of rifle is it?

Some metals will blue differently than other metals depending on the make up of the steel. Take a hardened steel Springfield receiver. It has more nickle in it and will blue a completely different shade of "blue" than a modern chrome molly barrel. There is nothing that you can do about it.

Basically the more carbon that the steel has in it the darker the steel will blue. Steel is a controled rusting and the blueing salts attack the carbon as the carbon is what actually rusts.

Also if there is anything that has been hi-temp soldered like a bolt handle or sights the solder will not blue at all. It will stay silver.