Badass optic - Vortex SPARC AR 1x22mm 2 MOA Red Dot Sight

Backed by the Vortex Warranty, this is a no-brainer choice if you don't want to spend 4-500 for the "E's". Optic is on point and adjusts easy. Stays zero'd....even after you dismount it and put it back in the same rail slot. Battery is AAA and comes with spacers to get the height you want. Perfect for an AR.