If you want fast and super easy sighting, buy a Simmons Red Dot Sight 42mm Tube 1x 4 MOA Dot with Integral Weaver-Style base.
They are only about $40 bucks, but don't let the price fool you.
They work awesome on a flattop AR-15. Holds zero and does not wander. Battery lasts and lasts.
Keep both eyes open when you shoot. That huge 42mm aperature is like looking through a big picture window.
When I'm running and gunning I keep both eyes open and all I see is the red dot. The scope "disappears".
No reason to spend all that money on an EoTech if you're just hosing under 200yds.