I recently purchased a Bushy carry handle from an ARf.com member to go on my Dissy A3 upper. When I was playing around with the elevation adjustment wheel, the lower part of the wheel clicks around normally. However, the upper half of the wheel (the part with the numbers on it), can turn independently of the lower part, especially when the rear sight is moved all the way up.

Is it normal for the top part of the elevation wheel to be able to move separately from the lower, "clicking" part that actually moves the sight? Is there a pin or something else that I'm missing that holds the two halves together?

Flip up the small app sight and look down from the top, there is a small hole.  There is a very small allen screw that you can access from the top.  It sounds like the screw is loose or missing.

Sarge

Thanks for the reply. Upon looking at the diagram on arf.com's main page I can see that I'm missing the elevation index screw that holds the two halves of the wheel together. I think the sight should still hold a zero fine though.