I have already decided I want an RRA instead of Bushmaster, Colt, DPMS, or Armalite.  I just wonder which model RRA I should buy?  I will be using the rifle mostly for training purposes, but also will go prairie dogging a few times next summer, and some medium range target shooting(200-500 yards, probably more 200-300).  I am looking at the tactical car a4, elite car a4, entry tactical, and car a4 models.  I will have a red dot sight mounted, but will have a detachable  type tactical handle, so i can mount a full scope on the actual flat top.  I was wondering if anyone has any ideas which model I should choose, and why?  Thanks in advance for the help.

which one do you like?

I like them all, or at least the ones I put in this list.  I was more or less asking the main differences.  I don't know which one would work best with a red dot, and switcing over to a regular scope on a regular basis might make a difference on which model to get, too.