Variable optics wash out the front sight. In my Leupold (actually 1.25-4x) the front sight is very blurry at 1.25x. It just gets worse as magnification increases. Some of the more true 1x variables may be better on low power but will quickly blur the front sight out as you zoom them out. A quick disconnect mount would be a good option if you are concerned about optic failure. Magnification and cowitness iron sights will not make a good combo.