Anodized refers to a protective and decorative finish that an electrochemical process applies to metal parts, especially aluminum. This process increases the thickness of the natural oxide layer, boosting corrosion resistance, durability, and color variety. Manufacturers apply anodized finishes to AR-15 and AR-10 receivers, hand guards, rails, buffer tubes, and small parts. These anodized components work with standard AR-15, AR-10, and other firearm platforms. They offer improved longevity, easy maintenance, and customizable aesthetics for custom builds and upgrades.