Paid $669 from MidwayUSA (see link below), once I got it mounted I discovered I have an astigmatism in my right eye, rendering it pretty much useless. LNIB, it was unmounted and put in safe. My stupidity is your gain, asking $575.
https://www.midwayusa.com/product/535852/eotech-exps3-2-holographic-weapon-sight-68-moa-circle-with-2-1-moa-dots-reticle-cr123-battery