the eotech is the 512.A65,it uses AA batteries(600 hours). i have fired over 200 shots with no loss of zer so far,i normaly use a browning BT-100 for trap and i am a fairly good shot. i just had the 1100 in the car from sighting in the eotech and thought i would try it, i did get a few wierd looks when i got it out,but after shooting a round with it,several of my friends wanted to shoot it, well they were very surpized, when they hit with it too. when i pulled it up on a bird with both eyes open it was very easy to follow the bird and superpose the circle dot on the bird and pull ahead and pull the trigger, it was easy to catch the bird and pull ahead and see the correct lead for me. the ones i missed were what looked like strait aways,but in fact were either breaking alittle left or right and i shot off to the left or right alittle high. i,m going to shoot it again on sunday and i will try it on five stand in the fucture. top is a browning BT-100 next,browning citori next two older rem,s 870TB and rem 870TC. eastbank.