Lead & Steel Llc ARCBT-BLK Mil-Spec Buffer Tube Black Aluminum, Stock Accessories

All L&S aluminum components are finished in Type III hard coat anodize because of its surface hardness, abrasion resistance and chemical resistance. Type III adds a 0.003 layer of hard aluminum oxide to the substrates surface. This layer is grown via a proprietary, several step electrolytic bath that prioritizes surface protection over all else, and the resultant color is dependent upon the saturation of compounds in the various baths, dye concentration, dye mix ratio, aluminum oxide case depth, starting smoothness of the part, etc.