We start with a solid brick of 7075-T6 aluminum and then precisely machine all of the critical features and dimensions of the AR15 lower in a single operation, ensuring that every receiver is perfectly in spec. We then broach the magazine well for a perfect magazine fit, hand deburr, tumble, and hard coat anodize. The result of our time and attention to detail is an AR15 lower receiver that will last you a lifetime and guarantee you a worry-free and quality build.