Red dot has not let me down. Aimpoint Micro, hands down.
Can't imagine a scope on a supersonic AR unless you're planning on 200+ yds regularly.
Forget the magnifier. Waste of weight, space, gadgetry...
Disclaimer...I have no experience (or interest) with a so-called pistol AR. But I run mine on an 11.5" 5.56, and it has killed many a beasts. What's your barrel length on the BO?
Disclaimer 2. If you're running subsonics...then stick with a scope so that you can dial in your dope at range. Same goes for bad eyesight...can't shoot what you can't see.