Why not blue it? Chances are that a mismatch will be parted out or turned into somebody else's project gun later on, so you're kind of burning your bridges by coating it. Once the coating is on, it will be more difficult to match the finish, and stripping it is a royal PITA. Not to mention the fact that it will look like an airsoft and wear like an Erma.
Rust bluing is a simple DYI process, you may not be able to get a 100% correct appearance but it will look way better than coating IMO. It's also easy to straw the small parts if you want to add detail to it. It may not be as durable as a professional coating job, but worn bluing sure has a much nicer and more authentic look than worn coating.
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