I have a DPMS AR-10 flattop. I would like to put a red dot sight on it. I have never had a red dot sight. I know some of you guys are VERY knowledgeable in this area. My A.O. is in Northern Idaho,,,woods & mountains. It needs to be weatherproof, dependable & if battery operated, it needs to run on common batteries either "AA" or "AAA". I do know that if I want magnification EO Tech has a magnification tube that can be added. Any suggestions from you more knowledgeable monkeys will be greatly appreciated.