Yes, Rustoleum Appliance Epoxy in gloss black is the best match for both the Maadi paint and the Russian paint. You basically dust it on from about 16". I let it set up for about 30 min, then I bake it in an oven at 350deg for one hour. It is a seriously durable finish after the curing process and looks identical to the original finishes. The key is to not putting it on too thick. It is very cheap, $5.98 a can at Lowes. One can will paint 2-3 guns.
Many builders use this finish, inquire about it here or on AKfiles.