Ya know, assuming the latch is square, that looks almost bad enough that the underlug is either not on the barrel square, or the pivot is cut a bit off, how do they look? If you set the barrel upside down on a level surface on the scope rail, is the lug level too? In other words, is the bottom of the lug parallel to the top of the scope rail when looking towards the muzzle from the breech? How's the pivot in comparison to the top of the scope rail? That will take a little more to check, maybe use a 3/8" dowel in the pivot and see if is square to the bottom of the underlug?

Tim