I am a Rookie Officer that is just about to be released from FTO. I have heard many officers strongly suggest to get an AR15. I have prior military and have carried M4''s for most of my military career, so I am familiar with them. However I was just wondering if you had any suggestions for me about buying one? What do you think is a good brand to get or not to get? What kind of accessories do you suggest to get or not to get.