I have used an EOTech 511 on a 223 rifle with good results. With a steady rest hits on milk jugs out to 200 yards are pretty easy as well. Haven't used one on a handgun though but I can't imagine it being all that different. On my hunting revolver I use a 2x Luepold and love it, haven't had any issues with it whatsoever. This isn't the classified section but I am currently thinking about selling the eotech if you want a good deal. Good luck finding the right sight, it's never easy!