How hard is it Dura Coat a rifle?
If you have a Harbor Freight or one of the tooling stores around you, pick up a cheap airbrush kit. If you have access to an air compressor, get one of the cheap sand blaster kits too.
Remove the barrel & action from the stock and any hardware like scopes, etc.
Tape off the action if you don't want to coat it too.
Sand blast the barrel to remove the corrosion and old bluing. Wipe clean with brake cleaner. I like to hang the item to coat, in the sun, and let warm if weather permits. It will dry much quicker when it's warm.
Mix the coating, it's an epoxy mix, and light coat the item a few times with a few minutes between coatings. Less is better when coating.
You can handle it after an hour or two of drying and assemble after a day or so. It hardens totally in a few weeks, but you can use it after a day.
Duracoat is all that I use. All kinds of color choices too. I have the flat black, the stainless and the gun blue colors. You can do 3-4 complete guns or several barrels out of one 4oz color kit.
I run about 10-12lb of air pressure on the airbrush. Clean is the key to a good coating, so no fingerprints on the area to coat.
NCsmitty