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Should I get the 552 model or should I get the XPS3-0? What are the advantages and disadvantages? I will be putting it on an NEA 15. I already have mbus2 on order.
It's personal, but I really like the AA batteries used in the 512/552 sights. Unless compactness is high on your list, availability of batteries was the deciding factor for me.
Good luck.
IBD
I like the XPS2 model. Has one transverse CR123 battery which makes it nice and compact. The XPS2 model is non night vision compatible. That allows you to save some money as 99% of the users do not have night vision anyways.