I have 3 AR's. 2 M4's and an AR 10 set up as a Sniper type rifle. What I want is opinions on how to set up my 2 M4's on optics. I have a S&W and a Daniel Defense. As of now I have an Aimpoint Pro on my DD, and my Smith has a removable carry handle on it. I have a couple ideas that I'm pondering. One is to buy an Aimpoint Micro, and put it on my DD and slide the PRO unto the S&W. Then, however I would just have two M4's with red dots. My other thought is to get some type of 1x4 or 2x8 style variable scope to put on my smith, I like the Nikon AR series. The Smith rifle would be used for everthing from the range to hunting. I have about a 600 budget. I am at a real dilemma on what to put on it. Thoughts?