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AR15.COM
1/29/2015 12:23:53 AM EDT
I recently had a Geissele MK1 rail installed on my Colt 6920. While trying to sight in my Troy flip up sights, I am having to max out my windage to the right to get on paper. I just installed a set of Magpul Pro sights tonight and I am still having to make adjustment to the right. I am curious if anyone has any ideas to help me cure this?
1/29/2015 11:38:11 PM EDT
[#1]
We found out that the M1913 spec is not being followed by industry.  On a lot of ft sights (ones with a certain way of mating to the rail) they will need windage adjustment to zero up on our rails.  Now we are making the M1913 version that everyone is using (top of flat is lower).  

In a nut shell most of the windage will need to be used.

If this is bothersome we can try to help you out, but we dont make the MK1 anymore.
2/4/2015 7:49:55 PM EDT
[#2]
I will run it back out to the range and see what I can do. What rail model has this resolved?