I've never been much on optics, maybe because I've never really had a good scope. I was trained to shoot iron sights in the Army out to about 300 meters. Mostly M16, some M14 and M1. Well I'm older and I can't see 300 yards much less 100 yards. I've got a couple AR15's and I'm thinking of building an AR with the idea of putting some type of optics on it. I'd like a red dot or a EOtech Holographic or something similar. Longest distance shooting would be 100 yards with factory ammo. Would like something with long battery life and something easy to use with bifocals. While I'd like to think I'd grab this rifle to defend the house, odds are I'd just use the shotgun. Also, I'm going to buy a completed AR 15 upper and I'm thinking of one w/o front sight post. I'd like some suggestions on this also. Thanks for any comments or suggestions.