Cool, so as long as you can shoot the inhumanly fast robot with a laser, or close the distance, work out how to remove it's battery and then do so, or gum up its joints - before it shoots you with a bullet - you're safe from gun-wielding robots.
Of course, protective lenses can be added to robots designed for the military or security, so even the safest of those options is unlikely to be at all feasible.