Guy comes in to where I work today complaining that his Aimpoint did not have enough adjustment to get it propperly zerod. It was shooting low and the adjustment was sure enough bottomed out. The set up he had should have worked just fine, it was a Colt flat top with a RAS II. Aimpoint was mounted in a #22M68 on the RAS II "bridge". Same way I have one of mine in fact. I dont know why, but the Aimpoint was clearly mounted crooked in the ring. I didnt ask why he had it like that, just figured there must be some reason he didnt want it striaght? Anyway, I had never considered it before, but I didnt think it would make a difference in the least bit if it were mounted crooked. But wanting to start simple, I asked him if he minded if I straightened it out to see if it would matter. He didnt mind, so I set it straight and that was the fix. Thinking about it now, I guess I can see how it would make a difference. Anyway, just thought I would pass it on in case anyone was interested. I thought it was interesting.