Agree on not leaving the steel bare, unless it's stainless.
For DIY probably your best option is bluing. Research the net on it. and here's an inexpensive kit:
http://www.midwayusa.com/product/860...h-instructions
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If you want to shoot...shoot...don't talk! Tuco
USAF Munitions 1969-1992
RVN 1972-1973
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