AR sight in question

[shibbershabber]

So I've got this AR, its a 20" heavy barrel with standard A2 iron sights, never fired and freshly assembled..

I recall that there was a way that you could sight it in at a short distance, like 15yds or something, where when sighted in at that distance you would be on target at 100yds. Then you should be equally on target at 200, 300, etc by adjusting the rear sight accordingly...


Anyone know what that distance is? Or direct me somewhere?

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[808hondacrguy]

I was told it was 25 yards, but never checked it out.

 

[Charliehorse]

50yds should be close to on at 200yds.

 

[v0lcom13sn0w]

50yrd with xm193 is the same as 200-225yrd

 

[v0lcom13sn0w]

heres a chart:

 

[rick benjamin]

Thanks to LTC Chuck Santose for his battle sight zero article
http://www.ar15.com/content/page.html?id=599

 

[mjbskwim]

Done this with most the ARs I have built. Your 'point blank' range is at 25 yards and again at 100 yards (where the projectile crosses the cross hairs)
So take a target to 25 yards to get your horizontal,mostly. Then get your upsy downsy close.
Dead on should be real close at 100 yards. Then set it at whatever distance you want.
If you don't do it in close,you waste a lot of ammo.
First hand knowledge

 

[mortre]

Set the rear site elevation to "z" and then use the front site to zero the rifle at 25 yards. When your done just click the rear site drum back to 3/8.

 

[Member 5605]

All you want:

http://www.ar15.com/forums/t_3_18/497571_0_2___The_A2_Rear_Sight_Aperture.html
http://www.combatsimulations.com/ar15/sightin.htm
http://www.armystudyguide.com/content/army_board_study_guide_topics/m16a2/zero-and-m16a2-rifle.shtml

and use a 50 yard zero not 25. You don't need this in battle for suppression fire.

First step is always a "mechanical zero" of your sights. From there you can dial the rifle in to your precise distance. Most zeroes should happen with less than 12 rounds. 3x 3 shot groups is enough using the proper target.