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I have been looking at them as well. The 5x is about half an inch longer than the 4x. Wasn't sure if it would fit on a my VZ58 and not get casing ejected at it all day.
I bought one on a black Friday deal last year and have it mounted on my armalite. 308ar. Nice optic good clarity and have had no issues with it at 200rounds. The scope to base screws came loose after 10rounds so I loctited them and no issues since. Let me know if you have any specific questions.
Thanks for all the responses guys. Short eye relief is a concern, although I guess that's par for the course in optics such as this in the price range. I plan to use it for 100-200 yard shooting on an xcr in 556.