AR Sight Misalignment

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johnmcl

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Apr 1, 2005
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Northern VA
Hi all,

So I'm zeroing in an AR and discover that the windage is way left when all is done. (Nice groups by the way).

This seemed out of balance to me, so I dropped a pair of levels on the front sight base and the carry handle. I leveled the rifle so that one bubble was between the lines and sho' enuff the other one was a half bubble off.

Take a look at the attached photos.

Any advice for the corrective solution? Has anyone had a similar experience? While I can live with it as is, I'd prefer the maximum adjustability for those windy days at long ranges.

Thanks in advance,

John

rear aperture.jpg

rear aperture with level.jpg

front sight.jpg
 
The front sight is canted very, very slightly to the left (less than one degree). You could reseat the barrel to correct this, but you might have to make a few swipes with a file in the alignment slot on the receiver to do it. Not worth the trouble IMO. It won't cause any functional problems unless you have a strong wind from the left side

Ignore the fact the the sight ears aren't level. They aren't a critical dimension and are often slightly different heights.


Edited to add: It could be the front sight post is out of spec or bent. Shoot a five round group then turn the front sight post two notches and shoot another group (ignoring the elevation change). See if the group moves to the left or right (diagonally). If it does, turn it back to the starting point and repeat one more time. If it still moves, replace the front sight post.
 
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