Was thinking of an Aimpoint Comp M2 but 4MOA dot seems to big for a weapon with this accuracy. Any suggestions? EOTech? Trijicon?

That rifle is gonna be effective to about 800 yards. It would be a nice thing to have a good optic, with a good field of view, to engage stuff at longer distances. The ELCAN has good eye relief, excelleng glass, 3.4x magnification and a reticle that is calibrated for NATO 7.62 ammo. IMO, it's the perfect choice. If you look hard enough and can wait a little, you should be able to pick up an older, lightly used model for around five or six hundred bucks.

Have the DPMS 7.62 "Sportical" and put the Eotech 556.A65 with 3x flip-to-side and love it. Sportical does not have the iron sights and the 3x was enough for me for the price difference to a 4x.