Getting brand-new AR-15 set up (irons and scope)


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Shmackey
July 27, 2012, 08:00 PM
I've got a Colt LE6920MP (flat top with Magpul furniture) coming to me next week. While I'm very familiar with zeroing in a bolt-action rifle with a scope, I don't know the best approach for getting my Colt dialed in.

For my .308, which obviously has a scope and no iron sights, I've got it zeroed at 100 yards with the scope nearly bottomed out. Pretty much standard procedure. But:

What's the "correct" zero range for a red-dot scope on a close-quarters rifle? (I will almost never shoot this AR past 100 yards, with <25 being the norm. If I ever had to use it in self-defense, it would be <10.)

Do you get the iron sights dialed in first, and then do the scope as a separate step so it matches?

The Colt has a regular F-marked front sight and Magpul backup rear sight. The scope is a Vortex SPARC.

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Sam Cade
July 27, 2012, 08:27 PM
Do you get the iron sights dialed in first, and then do the scope as a separate step so it matches?


I zero the irons, then move the dot to rest on top of the front sight post while maintaining proper sight picture.


I zero rifles for 50 meters.

Good discussion on the ins and outs:
http://www.m4carbine.net/showthread.php?p=798061#post798061

fanchisimo
July 27, 2012, 09:06 PM
I believe in an AR if you zero at 50m, it is also good for 200m due to the trajectory. The army uses a 25m zero that also hits at 300m. One thing I've seen in the army is some zero their irons for the 25/300m zero and the scope at the 100m, but that is preference. What a previous poster said is true, that you can zero the irons and then set the dot in line with them, but be sure to confirm that zero by itself.

Shmackey
July 28, 2012, 03:12 AM
Thanks guys. I also found this, which has been interesting:

http://www.m4carbine.net/showthread.php?t=17049

madcratebuilder
July 28, 2012, 07:37 AM
The 25 or 50 meter is the most common used zero. Like other here I set the red dot on top the front post after I zero the irons.

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