sentences:  It is only sold as a complete weapon in .45 ACP and 9×19mm Parabellum, though due to the nature of the weapon the auto trigger pack is compatible with any Vector lower.The 9mm model uses Glock 17-compatible magazines (typically the extended 33-rounder used by the Glock 18) and the .45-caliber model uses Glock 21 magazines.Semi-automatic versions are produced and available for the US civilian market.