The process I described was from the Springfield Armory. A torch was used in the description but I improvised and used the gas grill. I figured I could get a more reliable temp from that without risk of overheating. The results I got from doing it multiple times didn't seem to improve the finish darkness. I soaked the trigger guard in ATF tranny fluid, which may be the secret to the dark blue I got from the process. I had a very popular restoration gunsmith in my area look at the work...he was amazed I did it on a grill and got the right color blue. So far the parts finish has been very durable.
