I just mounted a gen 2 X-sight on my new Axis XP. Yep, you need a full size rail and I mounted the sight itself to a 7 slot QD rail, so I can move it around all my rifles. That also gave me plenty of clearance with the bolt and ejection port. This does put the scope a little high on the rifle, but I get to keep the scopes eye relief where it belongs (old eyes need all the help they can get).
Not sure if you're still working on this issue, but figured it might also help someone else.
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