I'm trying to decide on a flip-up rear sight and scope rings for my new flat top AR (my first flat top). Problem is, I'm not sure what I need. Instead of going with the trial and error method, I thought I'd ask here. Below is a picture of my AR. What flip-up rear sight would I need to match up with the front sight? What height scope rings would I need to clear the front sight? Any help would be wonderful. Thanks.