Very reliable - Aimpoint CompM3 Red Dot Sight

First, this has an outstanding eye relief meaning your field of view for quick target aquisition is superb. Secondly, the single targeting dot. There is no distraction or obscured view by outer rings or secondary dots. Thirdly, Parallax free meaning where ever the dot is your round is going no matter how your viewing your dot. Lastly, battery life. I dialed mine in so that my 3 round groups are in less than one inch groups at the 50yd and 100 yd line. I was also easily able to hit steel plates of 12" in diameter at 250 yds. If you want to be a minister of death praying for war this is the Optic for you.

I recommend the EOtech G33 3x magnifier as a required addition. The Eotech magnifier allows that extra clarity at distance and the cool thing about this magnifier is it lines up perfectly with the Aimpoint and the up/down and left/right adjustemnts on the magnifier allow you to center the aimpoint dot in the magnifier.