Most people never switch from optics to irons.

You need a mount designed specifically for AR's like the PEPER mount mentioned by Grjfer. Simply using extra high rings won't allow the scope to be mounted far enough forward.

The scope should be mounted with the objective even with, or forward of, the rear of the receiver. You will be able to access the charging handle much easier with it mounted even with the receiver and modern technique with an AR requires being square with the target instead of blading sideways. You may even have to shorten the stock one or two notches for this technique, but you will find the rifle is much easier to fire fast and accurately.