Outerwild Manufacturing produces our AR10 BCG which is trusted by seasoned shooters and depended on by experienced builders. Our goal is to go above and beyond Mil-Spec expectations! The Outerwild secret sauce: PRECISION GROUND. We machine and grind our BCGs to last for tens of thousands of rounds. We grind the outside dimensions and ALL three interior dimensions, giving our BCGs a near friction-less surface finish. To ensure long-term reliability and corrosion resistance, Outerwild partners with industry-leading finisher: H&M. Their Blacknitride+â„¢ finish delivers the utmost durability and improved lubricity for our BEST-IN-CLASS BCG that is 100% American Made!