I was thinking of getting a EOTech for my AR,found a guy in college that needed cash for school that had one on another site.I didn't think much about it since he said he has had it for awhile,figured it had nomal wear from being mounted,but he still had the box!Contacted him and bought it for his price! When I received it I swear the thing has never been mounted,even had factory warning card about loctite in box...so I got a new EOTech 512 revision F with priorty insured mail for $320.00! The guy was great to deal with and I told him I hope he upgrades when school is out!