Iron Sight Adjustment

[Modoc ED]

Example of how to calculate amount of movement (drift) for rear sight alignment:

Shots hitting 6-inches left  at 100 yards:  Measure distance between front and rear sights in inches.  Divide result by 3,600 (number of inches in 100 yards).  Multiply the result by 6 inches (number of inches shots hit off center).  (i.e., Distance between front and rear sight = 20".  20 divided by 3,600 x 6 = .033 which is about 1/32").  Move/drift rear sight 1/32" to the right (direction you want shots to go in this example).  You should be dead center or very close.

Example of front sight replacement:

If you are still hitting about 6-inches low at 100 yards and your rear sight is adjusted as high as it will go, replace the front sight with one that is at least 1/32" higher.  A 1/16" higher sight would be best as it would allow plenty of room for both up and down adjustment.

Most people don"t realize and are surprised that it takes VERY LITTLE MOVEMENT of iron sights to adjust them for correct sight alignment.
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KeithL -

I think this  would make a good sticky.

[Rangr44]

This is the link to Brownell's Sight Height Calculator:

http://www.brownells.com/aspx/NS/GunTech/sight.aspx

[Keith L]

Done.  This thread is now linked in the stickies post.

Thanks guys!

[quickdtoo]

Example of how to calculate amount of movement (drift) for rear sight alignment:

If you are still hitting about 6-inches low at 100 yards and your rear sight is adjusted as high as it will go, replace the front sight with one that is at least 1/32" higher.  A 1/16" higher sight would be best as it would allow plenty of room for both up and down adjustment.

Most people don"t realize and are surprised that it takes VERY LITTLE MOVEMENT of iron sights to adjust them for correct sight alignment.
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KeithL -

I think this  would make a good sticky.

Increasing front sight height will result in POI being lower, not higher. To raise POI, a lower front sight or higher rear sight is needed.

Thank JerryKo for that correction.

Tim

[Keith L]

The correction is noted.  Thanks to Ed, quickdtoo, and all the others who participated in this post.