That weapon has very little bluing. It's largely cheap parkerizing, but regardless the metal will stand up under stripper well enough. Bluing it would cost more than it's worth. Just keep it clean and all is well. The stock is yellow pine, or some Oriental variation and once stripped will swell when it gets soaking wet, but it is not fitted to any significant tolerances so you are okay there, too.
Look, the thing was built to be dropped in a rice paddy and still shoot. You can hardly hurt it. :)