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11/26/2008 1:54:58 PM EDT
I just got my first flat-top carbine a few weeks ago, and I have been reading the forum for a few weeks now, trying to glean as much information as I can before pestering you all.

My Carbine is an Armalite, with the fixed front sights, and I just got a Troy flip up rear sight, I intend to finish it off with an Eotech 512, but that is over a month out for me given the cost. Been buying ammo and mags, per everyones advice given the political situation.

I have read recently on this board, somebody recommending zeroing the sights for co-witness at 50 yards/meters - isn't that a bit short range? Doing this years ago, we zeroed at 100 yards.

And, yes, now that I have sights on it, I will take a picture after dinner tomorrow, and post it.

Happy Thanksgiving to you all!
11/26/2008 2:12:47 PM EDT
[#1]
No, 50 yds puts you 1.5" low pointblank, dead on at 50(obvious) and about 1.5" high at 100(or was it 2") then your dead on again at about 225yds, and around 1.5"-2" low at 250.  I dont know all the exact numbers, but it takes advantage of the flat trajectory of the 5.56 and keeps all the shots within 3" or so from 0-250+ yards.
11/26/2008 2:20:12 PM EDT
[#2]
I believe 25 yards is the correct zero for an eotech or aimpoint but I could be wrong.
11/26/2008 2:34:49 PM EDT
[#3]
here a picture that i got from this threat that could help you out

http://www.ar15.com/forums/topic.html?b=3&f=18&t=328143&page=3

http://www.box.net/shared/static/nfvs15lgfg.jpg
11/26/2008 2:39:06 PM EDT
[#4]
In simple terms, remember the sight post is roughly 2" higher then bore center.  So at 50 yards these two 'planes' converge, hence the bullet is actually rising at that point to meet the sight line.  Then the graphs will make perfect sense.
11/26/2008 3:06:04 PM EDT
[#5]
Quoted:
I believe 25 yards is the correct zero for an eotech or aimpoint but I could be wrong.


You are wrong.  Best zero is at 50yards.

11/26/2008 3:18:04 PM EDT
[#6]
IBSZ
11/26/2008 3:32:34 PM EDT
[#7]
Thanks a lot Guys! The graph helped make perfect sense of it.

And a 50 yard zero on the Eotech when I get it in my grubby little hands.
11/26/2008 3:34:08 PM EDT
[#8]
I would say 50 for the eo tech, an inch or two +/- wont matter if your shooting at a person.
11/26/2008 3:39:24 PM EDT
[#9]
I get stuck having to go to a 25 yard only indoor range sometimes, so I try to zero at roughly 1 1/4" low for a quick and dirty until I can get out to NRA or outdoors.
11/26/2008 4:05:12 PM EDT
[#10]
Everything you need to know about zeroing is in this thread:

http://www.ar15.com/forums/topic.html?b=3&f=18&t=328143

The short version though, is that if you're using a rear sight that doesn't have elevation adjustments, just zero it at 50 yards. That'll put you at about a 200 meter (219 yard) far zero, and the bullet path will not go over about 2" above the line of sight at any point between the near and far zero.
11/26/2008 4:33:13 PM EDT
[#11]
Quoted:
I believe 25 yards is the correct zero for an eotech or aimpoint but I could be wrong.


You're wrong... 50 yds.



Oops!  My good friend Forest beat me to it.

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