Their will be a difference in lengths.
552 will be longer in the front to make up for the AA Batteries.
Also, if you get the AA battery 552, its easier to load up on batteries and also to change out in the field. Chances are if you ran out of batteries, someone else at the field will have a extra set.
The newer models, are suppose too have worked out some glitches. I guess the older models had a ghost image problem, (kinda like a double vision)
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