I have a brand new in the box Eotech 516.
This is the one with the controls on the side.
I much prefer these over the older ones with the buttons on the rear, especially if you are planning on adding a magnifier.
Uses CR123 Lithium batteries, battery life is approx. 1100 hrs.
$425 $399 includes prompt insured shipping to your door with a tracking # supplied the evening I ship.
Paypal OK +3.5%