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MBUS Sight Help

 
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Old 01-11-2013, 11:32 AM
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Join Date: Nov 2011
Location: Hartsel, CO
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MBUS Sight Help

Got to shoot my very first AR the other day and got my scope zeroed. I'm running Magpul MBUS sights on a 45 degree off set and I got the windage set but I lost my instructions and I'm not sure how much to adjust the front sight. I remember reading 1/4 turn = (X) change in impact but I don't remember the value of X and can't find it online. Any help would be appreciated. Thanks
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Old 01-12-2013, 07:54 AM
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Join Date: Nov 2010
Location: Billings, MT
Posts: 332
Re: MBUS Sight Help

If this is a A2 front sight, then 1 click of elevation change is equal to 1 1/4" at 100 yards.

You can tell the difference by looking at the front sight post. If the sides of the post are square, and if the base has only 4 cuts in it, it's an A2 sight. The cuts are where the detent rests. If the sight post is rounded, and the base has 5 cuts, then you have an A1 sight.

The A1 sight is a 1" per click at 100 yards adjustment.

Better to know this now rather than find out when you make dope changes at the 300 yard line!

I admit I stole this off another site. I thought I'd google my answer to check my recollection. Then I decided it was said quite well, and much easier to copy and paste here. The adjustments are for 20" barrels. I can't remember if Carbines get a little more movement of the bullet strick due to the shorter sight radius.

Test it out, shoot a 3-5 round group at 100yds, adjust a few clicks, shoot another 3-5 rd group. Take how far the new group moved from the old group, and divide by the clicks you adjusted, that's how far one click moves the round strike on your rifle.
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