Birchwood Casey Perma Blue Liquid Kit. Easy to use Perma Blue Liquid Gun Blue is the proven way for touching up or completely reblueing most guns. Fast-acting liquid gives a non-streaky, uniform blue-black finish to steel. Everything you need to do a professional looking job is included in this kit.
Kit includes:

3 oz PERMA BLUE Liquid Gun Blue
3 oz Cleaner-Degreaser
3 oz Blue and Rust Remover
00 Steel Wool Pads
Blueing Applicators, Sponge, Service Cloth
BARRICADE Rust Protection Gun Wipes
Complete Instruction Guide