Thanks for the links. They're both excellent. :) You're hitting on exactly what I'm talking about in that RIBZ link. I have used that method to setup more than one 5.56 carry handle type rear sight, as I love being able to use the smaller aperture for the 50 yard / 200 meter zero. What I'm looking for here is info on setting up the LAR-8 carry handle iron sight the same way, as this sight is just like the standard ar15 one, in that it's lowest setting is the 8/3 position, and I'd like to be able to use the smaller aperture for a 200 meter zero, as opposed to using the larger aperture (I find it harder to be as accurate with the larger aperture). Has anyone here tried re-setting the drum to bottom out -2 or -3 clicks below 8/3 to get a 200 meter zero? I'm guessing that once I know how many clicks below 8/3 I need to go, I can just zero at 25 meters for a 200 yard zero the way I have done with my FAL and my HK91 in the past, right? (edited to add... now that I think about it, the ar15 carry handle sights have finer adjustment than the standard A2 sight, so when setting those up for the IBZ/RIBZ, you allow for twice as many clicks below 8/3 as with the standard A2 sight. Either way, I'm not sure of the number of clicks that would be needed for the LAR-8 carry handle sight.)