+1 on what Bozz10mm said. Pretty much anything extended latch will work. A standard one will work but it can be a pain depending on where you mount the scope.For a scoped AR, you will probably want something with a large latch release, like the BCM model 3B. Or possibly even an ambi charging handle. BCM makes some good ones.
https://www.bravocompanyusa.com/BCM-GUNFIGHTER-Charging-Handle-GFH-Mod-3B-p/bcm-gfh-mod3b-556.htm