No comb on AR stocks does present a problem. I like my optics a touch further foward so as not to interfer with the charging handle. Cheek weld is the issue and on my dog running gun (16" w/ collapsible stock) I am fine. With the latest flat top set up, I am still having issues and there are no front sights to even get in the way. Oh well....at least you figured out what works for you, it just looks awful high to look over the top of the scope on running critters.