CNC machined aluminum chassis takes full advantage of proven technology and accepts off-the-shelf AR-15/M16 free float tubes, hand grips, receiver extensions, and buttstocks. Heavy duty upper and lower wraps-around around the original receiver to create a one-piece unit and provide the starting point for an outstanding tactical platform. Upper attaches firmly to the top of receiver for a rock-solid mount and improved accuracy. Includes a built-in Weaver-style base 6½" long that allows a variety of options for mounting optics. Radiused edges give a streamlined appearance, reduce weight, and prevent snagging. Fits factory 10/22® barreled action and trigger group, including heavy barrels up to .990" in diameter. T6 aluminum hardcoat anodized for durability.