Phosphate coating can be applied to both the barrel and bolt carrier group for rugged rifle components capable of operating in extreme situations. ISONITE® QPQ (per SAE AMS 2753) is a high-performance variety of salt bath nitrocarburizing process. As a result of a vapor deposition process, these coatings offer a tough, micro-thin surface with great lubricity. It is also known as Liquid/Salt Bath Ferritic Nitrocarburizing (FNC) process. Cold bluing changes color of steel to an attractive dark gray and is best used for small touch-ups or worn areas on a gun. Nickel Boron usually costs more than Nitride and that money goes to more performance. And easier to clean. Only downside to nitride barrels are they do not break in over time, once you do you initial break in, the grouping you get is all your ever going to get until the barrel … Stay up to date on all of our reviews, articles, sales, and giveaway winners! Cerakote vs. Nitride The Corrosion Resistance King In a head-to-head test, Cerakote was put up against Nitride in a salt chamber to see which would be the most corrosion-resistant. Hot bluing is used most often in the manufacturers setting, resulting in a stunning blue-gray finish. This chemical coating requires no need for electrochemical reactions, leading to a more uniform finish. Phosphate is just basic parkerizing and will provide minimum corrosion resistance. However, much like a car or truck, corrosion is a primary concern with firearms. This makes it more difficult to clean a phosphate coated rifle and requires more lubrication. Each barrel was placed in the salt chamber and after just 8 hours the Nitride finish barrel began to show signs of corrosion. Phosphate. This method is known as the Taj Mahal of this genre of gun finishes as it offers unparalleled corrosion resistance. It’s also porous and will make cleaning more difficult. © 2019 Omaha Outdoors, LLC. Instead of adding material to the bore (like Chrome lining), Nitride treats the existing steel by imbuing nitrogen into the steel itself. Mag phos typically has a matte grey finish. Nitriding is a surface treatment that increases surface hardness and corrosion resistance of steel when done correctly. Every firearm in your arsenal is vulnerable, as even sitting idle in a gun safe will take its toll on your cold hard steel. Nitride is black and shiny. Treated parts increase in size, so adjustments must be made to accommodate that result. Titanium Nitride. Bluing of steel is a traditional way to protect firearms from corrosion while at the same time reducing glare. While Nickel Boron (NiB) is silver and shiny. Process. It is used on HSS and carbide cutters. No matter what conditions you put your firearm through, there is a finish out there that is ideal for your applications. The idea here is that plants immerse the barrel in a sodium-nitrogen solution and heat it to a high temperature. This is by far the most popular and well-known finish to have on a bolt carrier group. Rust, from elements encountered in use or from storage in a humid environment, is like a disease that eats away at your investment. Whichever you choose, each will provide an insurance policy on your investment to keep that firearm as usable and valuable as it was the day you bought it. On the plus side, this type of treatment does not change dimension of the piece, so there’s no need for gun parts to accommodate that increase. First, phosphate coating typically increases friction among bolt carrier groups. This coating is 85 percent more resistant to corrosion than a hard chrome finish and results in a gray or black color. MIL-SPEC is manganese phosphate, which requires oil to provide excellent corrosion resistance on the outside of the barrel. And easier to clean. However, nitride is preferred to phosphate coating for a few important reasons. 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