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9/22/2017 12:11:25 AM
Posted: 10/28/2002 5:34:02 AM EDT
For standard A2 sights, the Bushmaster operators manual gives the adjustment per click for the front sight elevation and rear sight windage. Based upon the numbers in the manual, these adjustments work out to 1.2 MOA per click for the the front sight post and 0.43 MOA per click for the rear windage. These seem a little odd since I would have expected something like 1.0 and 0.5 MOA. But the manual does indicate that three clicks of the windage are needed to adjust as far as one click of the front elevation. Anybody know how the military selected these adjustment values? Also, what is the MOA/click for the rear elevation adjustment? Thanks.
Link Posted: 10/28/2002 7:25:19 AM EDT
Front sight USED to be 1 moa per click when they had the round front sight post. When they went to the square front sight post (better sight picture) you could only have 4 detents per turn (as opposed to 5).

They kept the same threading to keep it backward compatible with the old parts so it worked out to 1.25 moa per click.

I don't know why they have the .43 MOA for windage on the A2 sights.

Each click of the rear elevation is about 1.4" @ 100M - most people just call it 1 moa, but it is a little more than that.
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