Nitride black is a durable coating applied to bolt carrier groups (BCGs) and other firearm components, created through a nitriding process that hardens the steel surface and gives it a sleek black finish. This coating enhances wear resistance, corrosion protection, and smooth operation. Nitride black is commonly used on AR-15 and AR-10 BCGs, bolts, firing pins, gas keys, and small internal parts, making them popular for their longevity, easy maintenance, and reliable performance in demanding conditions.
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