Wife was wanting to get me something for Christmas and really got MORE CRAP THAN I NEED but I threw out some ideas

MY PSA AR15 just has a peep sight on it so I mentioned a sight for that


Well naturally she went overboard for a sight on a gun I seldom shoot but she was happy she picked it out herself


Anyway I mounted the sight (MEOSIGHT II 50-red dot sight) and while trying to bore sight it I can see the vertical adjustments move from top to bottom but the horizontal(side to side) does not seem to move AT ALL. At first it was off a little and I adjusted it but it went too far to one side and does not seem to budge at all now

Am I doing something wrong or is it a defective sight