I figured since im doing a battlefield pick up with this build, why not experiment a bit with some blueing. So I decided to try the fastest and easiest, cold blue. Sanded and buffed the receiver removed the surface rust which grows like weed down here in south Fl because of the humidity. I did not do a perfect polish job because its just a battlefield pick up, could have buffed out the raw metal like chrome but I did not want to spend that much time on it. This it after a thin coat of gun oil.