WE addressed this problem As being your after market scope mount, if you had a original scope installed in your mount the post will be canted . I have the same Gun Parts scope and when installed in one of my original No. 4 Mk. I snipers the post is not canted . When I place the scope from the original sniper in the after market mount the post is canted . It can be fixed with out too much work on the mount . Gun Parts scope is , at lest the one I received, is of excellent quality and workmanship .