Let me preface this with: I tried this once before, and hated it. However, I'm willing to give it another try, mainly because I want to hunt deer with a pistol next year, and I think the RDS may be a bit more accurate than the irons..........especially since my eyeballs don't work quite as well as they used to. So which RDS should I get? Viper, Venom, Fastfire III? Whatever it is, it must be able to change the batteries from the top, I don't want to have to remove the whole sight just to change the battery. Also, prefer a 2-3moa dot, last one I used was a 6moa and I felt the dot was too big. I don't have very much experience with the micro red dots so I'm looking for some knowledgeable input. Thanks