Nickel boron is a premium coating applied to bolt carrier groups (BCGs) and other firearm components, offering enhanced hardness, corrosion resistance, and a slick, low friction surface for smoother operation. This coating is commonly used on AR-15 and AR-10 BCGs, as well as bolts, hammers, triggers, and small internal parts. Nickel boron coated parts are popular among shooters and builders for their durability, easy cleaning, and reliable performance in demanding conditions.
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