Difference between Eotech 512 and 522

[jeepunlimited80]

I'm looking at getting an Eotech for my AR and I was wondering what the difference is between the two.
Thanks

 

[scotty]

No such thing as a 522. There are the 511 and 512 which are the "Tactical Models" with non-NV compatability and the 551 and 552 series which suport Night Vision. 511 and 551 are the N Cell battery versions and the 512 and 552 take AA batteries.