This is a new Fusion Mil Spec Barrel Bushing for full size / government pistols. This barrel bushing has been produced to be "drop-in" style. All machined in the USA on state of the art CNC turning centers. All machined from pre-hardened bar-stock. Absolutely no warping or distortion from after machining heat-treat processes. These are the best that barrel bushings get. All made in the USA.