Hello. I have both 20 inch and 16 inch barrel Ar's and I like the 16 inch one best for my calling rifle. It is lighter and has a collapsabel stock so that I canshorten it according to the amount of clothes I am wearing. It has a red dot scope on it and flip up sights. It is for use when on patrol but makes a great varmint rifle on the side. My 20 inch barrel AR has a 4.5x14 scope and I like that for much smaller targets. It does not have the colllapsable stock so to me, it isn't as user friendly! --Tim