Birchwood Casey Super Black Touch up pen.
Birchwood Casey Perma Blue Liquid Gun Blue Kit
Birchwood Casey Presto Mag Liquid Gun Blue
Easy to use, all-inclusive kits are the proven way to touch up or completely reblue most guns. Everything you need for a professional-looking, first-class job is included. Choose from the fast-acting Liquid Gun Blue Kit and the deep, dense Paste Gun Blue Kit. NOTE: PERMA BLUE Liquid Gun Blue will not blue stainless steel, aluminum or non-ferrous metals.