zenitco russian zenit b13 ak side optics rail mount zenitco this is for the brand new russian made genuine zenit rail mount. will fit only the standard side base mount. it can be installed fast and easy. weight is 175 gramms. the base is fully cnc machined from the single brick of d16t aluminum alloy (aluminum+magnium+copper). rail length is 20 cm (7.82 inches). this mount is used in russian special police units.