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Posted: 7/4/2009 9:30:16 PM EDT
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Got a new upper the other day, went to sight it and had to make a windage adjustment for 12 clicks right at 25 meters.
Ok long story short, I thought I had a slightly canted front sight base. I did an experiment with an aimpoint T-1 and a KAC600m rear sight and had an interesting observation. 
Rear BUIS centered, mounted behind the T-1 has the T-1 dot to the right of the front sight post in the sight picture. 
Now if I turn the BUIS around, now the T-1 dot lines up with the front sight. I have done this with 2 different KAC600m BUIS, so its not the BUIS. So now I am thinking that the FSB isn't crooked, but the rail on my upper may not be straight & true. Anyone have any comments or observations? |
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