This guide details the analysis of AR15 Bolt Carrier Group (BCG) coatings and finishes, drawing on extensive experience from Chad Albrecht of School of the American Rifle. It categorizes finishes from best to worst based on mechanical efficiency and dimensional accuracy, highlighting common issues with each type, such as corrosion with chrome, lubrication retention with phosphate, and potential brittleness with improperly treated nitride. The assessment emphasizes how coatings affect gas sealing and component wear.
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