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The 552 eotech from TSE is sweet, 2xAA batteries and w i d e field of view.
Some people prefer holosight, some red dot. I tried both and preferred the holosight for its wide clear fov. Some people find they concentrate on the reticle rather then the target on the holosights(reticle is fuzzy if you stare at it rather then the target), so they prefer the red dot. Try 'em both and pick.