Sold my A2 upper. Bought a BCM 20" Government profile A4 upper. My gun fund is pretty much tapped. What is an all-around good electronic sight I can pick up for $100.00 or less? I would also like some feedback on why sights without magnification are preferred to red dot type optics with magnification. I may be interested in 1.5-2X magnification if that exists in an affordable, quality package. I am also concerned with battery life / cost long term. I seem to recall seeing an electronic sight with a red illuminated reticle when on, and a black static reticle when off. Would that be a good way to go if most of my shooting is going to be done during the day? I will insist on having iron sights as a backup as this is my primary defensive firearm. Co-wittness would be a plus, obviously.