Trijicon ACOG TA11F

Hold your breath and count to 10

Aprox $1300

ACOG 3.5x35 Scope with Red Chevron BAC Reticle - The ranging reticle is calibrated for 5.56mm (.223 cal) flat-top rifles out to 800 meters. Includes Flat Top Adapter (TA51)

I'd also ditch the pistol fore grip and go with an angled fore grip.

Also consider adding an adjustable cheek rest.... no I don't mean a piano stool.