Armornite vs. other metals and protectants
Armornite™- Armornite™ is an infused nitride-based protectant that gets below the surface area of the barrel to protect against rust and corrosion. It also protects both the inside and outside of the barrel helping to prevent rust and pitting in the rifling as well as the breech area. Armornite™ is mil-spec and not only extends barrel life by protecting from rust but also abrasion created be bullets in the rifling.
Stainless Steel- In rifle and muzzleloader barrels, 400 series stainless is the most commonly used material which contains a large content of carbon steel. So although stainless is effective in preventing rust, in many instances can still allow barrels and other surfaces to rust over a short amount of time if not treated properly.
Ceramic Coating Finishes- Over the last decade ceramic coatings have become popular on muzzleloaders because they offer a strong virtually rust resistant coating that out performs stainless steel. But, ceramic coatings also have a surface area that effects accuracy if applied inside of the barrel. This means that these types of barrels are protected well on the outside, but are not on the inside where they have exposed carbon steel.
Black Oxide- Black oxide, also known as blueing is probably the most recognized protective coating that provides mild corrosion protection and a better appearance to the metal finish. Although in most centerfire rifles black oxide will do enough to protect for many years, in black powder it is the quickest to be affected by rust and corrosion.