Thanks for the input. I have been reading a little about it today.
regarding brands, looks like the Delta Point pro new model is bigger and very popular and good quality.
I see the delta point pro is around $369, $399,
https://www.amazon.com/Leupold-119688-Delta-Point-Reflex/dp/B00NWIYAD0/ref=sr_1_1?ie=UTF8&qid=1493772937&sr=8-1&keywords=leupold+delta+point+pro
which size is more common, 2.5 , 7.5?
any thought on the vortex?
what about trijicon?
thanks