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So I used some real steel rifle bluing on my M16. The results were interesting. : r/airsoft
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Triple-T #82: Hot salt bluing / blackening for knives - YouTube
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Amazon.com : Birchwood Casey, Westlake Market Super Blue Liquid Gun Blue Bottle - Double Strength Bluing Plus 25 Quality Cotton Swabs and 3" Cotton Patches for Restoring Guns and Other Metal Items :
Amazon.com : Birchwood Casey Presto Mag Liquid Gun Blue for Steel Complete Reblue Application, Gun Maintenance and Preservation, 3 Ounce (90ml) : Hunting Accessories : Sports & Outdoors