Looking into something small and low profile not like a huge red dot. Something like the Leupold delta point, burris fastfire. Like these

http://swfa.com/Leupold-DeltaPoint-Reflex-Sight-P78611.aspx

http://swfa.com/Burris-1x-FastFire-II-Red-Dot-Reflex-Sight-P12614.aspx