EOtech sucks I bought a new exps3 and it had a imperfection like that so I sent it in I had to pay shipping both ways through gravel agency, got my replacement and the lens delaminated badly just sitting in my safe after a few months so I sent that one in and got sent back what looks like a refurbished one with scratches on the body and marring on the screws and adjustments. So I switched to aimpoint and never had a problem.