Have you even considered a real handgun scope, such as the 2X Burris which will probably grace my soon to be reassembled 10.25 pistol upper?
Given the reduced ballistic characteristics of abbreviated 5.56 barrels, zeroing a 2X at 50 or 100 yards gives you a great sighting system. Using a carry handle mounted 1.5X Tasco I used to shoot "one ragged hole" groups at 50 yards with mine back in '93!
Obviously you must hold the weapon away from your body to obtain the required eye relief, and a bipod might not hurt. Metallic Sillouette(sp?) shooters have adapted a variety of shooting positions for unwieldy "handguns". NONE involve putting a recoil tube/buffer in contact with one's shoulder like a pseudo-SBR...
Either you can learn and understand how to use your AR pistol as a handgun; or you can flirt with using rifle sights, high above the bore LOS's, and other inelegant sighting systems. Try mounting a HANDGUN scope in Leupold High(about .45 between scope tube and rail) rings, setting it on sandbags, and actually developing some markmanship skills with your new "toy".
I am drawing on something like a quarter century of using a pair of Thompson/Center Super 14 Contender hunting handguns chambered in .223 Rem and 444 Marlin, so I know what works out to 200 yards.
Dots, lasers, and irons will hobble your ability to actually get good hits by preventing you from obtaining a steady hold with such a heavy handgun under field conditions. IMHO...
Paladin