Colt released an optics-ready Combat Unit Government pistol as a drop-safe Series 80 design in .45 Auto using a GI bushing and nested springs. Aftermarket plates from two retailers fit DeltaPoint, RMSc, 507k and RMR optics, with a cover that holds a transferable rear sight. CZ-owned Colt now offers similar optic cuts on several other 1911 lines including Commander and Gold Cup models.