I am guessing you got it covered but mounting your red dot to a AR platform is very easy. Don’t attach your lower, mount your optic with correct eye relief then you can literally look right thru the upper, center the circle of light in the shadow ring on same object you are dialing red dot to then assemble and you will be pretty close, fine tune a bit with live ammo. The hardest part is not moving the rifle as you toggle your head between looking thru bbl and looking thru red dot. Duct tape helps secure the upper! Hah! Using this method saves a lot of ammo!