Thread: Am I being a dick?

It looks like the screw holes for the rear base are out of alignment?
If thats the cause and the dealer didn't do the drilling and tapping I personally wouldn't be expecting them to put it right (though many dealers probably would). Secondhand you have to accept some risk, even through a dealer, different story if its a new rifle.

I would be asking them nicely to send you the bases free of charge, if they refuse I would buy them elsewhere.