(How's that for a thread title? I figured that would work better than a bolded 'ZOMG sitez no work!!!one!'
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I was working on Zeroing my two ARs today at 50 yards, doing the IBZ that is detailed here at the site. (They had been originally zeroed on the normal 25 meter combat zero. Which, I found to be inadequate for hitting steel plates out to 300 yards in 3-gun shoots.) Both guns were shooting low. My A2, which has a fixed front sight tower, was about 2.5 inches low. So, I cranked the front sight down about 6 clicks (sight post rotated abut 1.5 full turns), and it hit bottom. Now, for that rifle, it's just about on, although still a bit low, POI moved up about a little over 2 inches.
Now, on my Bushmaster Varminter, I have a YHM flip up front (the one sold by Bushmaster that clamps around the gas block.) It was shooting lower at 50 yards, about 4-5 inches. Again, I turn the front sight post about 1.5 full turns, and it too bottoms out, and the POI moved up about 2.5 inches.
Both rifles shooting the same ammo, some of our favorite 50 grain Federal bulk pack stuff. 50 Grains moving along at a bit over 3300fps per the chrony. They are extremely accurate through my Varminter with it's scope. Anyway...
My friend and I both thought that was a bit odd. But, before I go and order new sight posts or something else drastic (like an ACOG, for example) am I doing something wrong? At the beginning of this, both rifles' sight bases were flush with the sight tower base, and the Rear Sights were at their Zero Point (the 8/3 and 6/3 marker, and the sight all the way down in the handle.)