I followed the directions to use the IBZ on my 16" BM with a removable carry handle.  It has half clicks, so I had to do 6/3 - 4 (instead of 8/3 - 2).  

It's worked out very well and I love the IBZ.  The only thing I've noticed is that the rear sight seems slightly loose and I can slightly wiggle it back and forth horizonally.  I've tightened the set screw that you loosen to get to 6/3 - 4 and it still slightly wiggles.  


However, it doesn't seem to effect the sights or my groups, so it's obviously not moving in recoil.  

What's the deal?  Should I worry about this or just forget about it since it doesn't seem to have any effect?

Thanks for your thoughts.

Thats normal on ARs mine does it too.

Normal. Seems funky but thats the way they are.

Thanks for the replies guys.  Guess I just never noticed it until I dialed in the IBZ.  

this is occuring with mine too. I wouldn't be concerned other than because it not only seems loose it seems canted left too. the range will tell no lies though.

Thanks guys.  The sight is dead on.