Great option for close range - SightMark SM26010 Ultra Shot M-Spec FMS Reflex Sight

The Sightmark M-SPEC is exactly what I needed for close-range carbine applications. It is plenty bright for the days when the sun is shining, but seems to hold up well in respects to battery life. It is night-vision compatible if you are shooting on the opposite side of the spectrum with several brightness options there, too. Its holding its zero with no issues, even when it isnt babied and gets bumped occasionally. The glass is durable and clear, with the reticle coming into focus once you look at the target. The reticle has a large 65 MOA circle which is quick to aquire, but the 2 MOA dot in the center allows for more precise shots at distance where speed is less of a priority. You can't go wrong with this option considering it costs less than half what other options might be, such as eotech.