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Posted: 3/19/2012 8:06:44 AM EDT
[#1]
50 yards is a nice all around good zero point
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Posted: 3/19/2012 8:11:39 AM EDT
[#2]
Agree. 200 is a good 'all around' zero. The 50 yd zero will be pretty close to the 200 yard point of impact for iron sights on the ARs if you can't actually shoot at 200.
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Posted: 3/19/2012 11:11:37 AM EDT
[#3]
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Posted: 3/19/2012 12:07:23 PM EDT
[#4]
Good thread but I believe it says its not for backup sights since they don't adjust for elevation, just A2 carry handle sights. So I looked for one of those, the only one I found was a DPMS, but it says its not for f-marked front sights, which is what my BCM upper has. Now what??? 
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Posted: 3/19/2012 12:49:13 PM EDT
[#5]
Quoted: Good thread but I believe it says its not for backup sights since they don't adjust for elevation, just A2 carry handle sights. So I looked for one of those, the only one I found was a DPMS, but it says its not for f-marked front sights, which is what my BCM upper has. Now what??? The IBZ is the 50/200 zero. The rIBZ give you the ability to zero at 25 and 100, if you have an elevation adjustable rear sight. If not, then the IBZ would be the zero that is most useful to you. BCM sells the correct 3/6 rear sight, if you want one. |
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Posted: 3/19/2012 12:54:55 PM EDT
[#6]
Thanks for pointing out the BCM sight! Only DPMS and some really cheap ones came up on Google. The BCM sight is perfect for me.
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Posted: 3/20/2012 3:54:50 AM EDT
[#7]
The IBZ 50/200 is not yards. It's 50 yards, 200 Meters. I just wanted to clear that up because alot of people get it wrong.
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Posted: 3/20/2012 5:36:55 AM EDT
[#8]
I use 100yds. You never have to hold under, just over.
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Posted: 3/20/2012 5:53:16 AM EDT
[#9]
the 50 yards zero has you hitting low at 10 yards right..i forget..o wait just checked and it does hit low at 10 about 2 inches low.the 50yards/200meter seems like the zero your looking for op
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Posted: 3/20/2012 5:59:36 AM EDT
[#10]
I pulled this slide out of a larger slide deck. 100/200 is the best for same POA/POI across various lengths.
100/200 is the best for same POA/POI across various lengths, but 50 isn't bad. http://www.youtube.com/watch?v=Klvve0ZG_jo&NR=1&feature=fvwp |
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Posted: 3/20/2012 6:19:30 AM EDT
[#11]
Please forgive my noobness, but can someone clarify what is meant by 50yd/200m, or 100/200? If I go to my local outdoor range with my new AR, and I have the choice of 50, 100, 200, or 300 yards (not meters), which one should I be using to sight in so that I will need little or no adjustment if I use the other distances? Maybe that doesn't make sense.
Like in the above chart, if I sight in with a POA/POI of 100 yards, then the only time I would need to alter my POA is if I'm shooting out over 300 yards? EDIT: I think it just clicked, I read this on a different site - Mathematically, when a 200 meter zero is set the trajectory of the round crosses the line of sight at 50 meters and 200 meters. Is that what the 50/200 zeroing means? |
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Posted: 3/20/2012 6:28:08 AM EDT
[#12]
i believe if you zero your ar at 50 yards you will be on at 200 high at 100 and low with in 20 yards.correct me if im wrong
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Posted: 3/20/2012 6:28:44 AM EDT
[#13]
Watching the video I linked will help you understand it, but basically a bullet does not travel in a straight line, it arches up and down between the end of your barrel and the target. Along that path, the bullets typically hits the same POA twice....or close to it. When people say you have a 50/200 zero they mean the POI/POA is going to be about the same at 50 as it is at 200. Don't feel bad, it can be very confusing.
Correct, if the rifle was zeroed at 50 and currently aimed at the X, and you are shooting at 300 your POI would be about 4" low. 
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Posted: 3/20/2012 6:32:46 AM EDT
[#14]
Its starting to sink in a little, I wasn't thinking about the bullet arc.
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Posted: 3/20/2012 6:39:38 AM EDT
[#15]
Most will say a 200 yard zero is best because from 0 to about 250 yards the bullet is never more than about 2" +/- POI. However I can not imigine zeroing a rifle at 200 yards thus why the 25/50/100 yard zeros are more popular.
Despite what most on internet tells you they are NOT 1MOA shooters. 
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Posted: 3/20/2012 6:54:39 AM EDT
[#16]
Just watched the video, that nailed it for me. Thanks alot! So if I have an A2 front and rear BUIS all of the mentioned adjustments would just be with the front sight, and then I would dial in the windage as needed? Should I start with the front post all the way down?
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Posted: 3/20/2012 7:03:11 AM EDT
[#17]
Quoted: Just watched the video, that nailed it for me. Thanks alot! So if I have an A2 front and rear BUIS all of the mentioned adjustments would just be with the front sight, and then I would dial in the windage as needed? Should I start with the front post all the way down? You should start with the front sight post flush with the top of the Front Sight Base. |
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Posted: 3/20/2012 7:58:40 AM EDT
[#18]
Quoted:
Quoted:
Just watched the video, that nailed it for me. Thanks alot! So if I have an A2 front and rear BUIS all of the mentioned adjustments would just be with the front sight, and then I would dial in the windage as needed? Should I start with the front post all the way down? You should start with the front sight post flush with the top of the Front Sight Base. And dial windage as needed. Although the windage adjustment isn't only for wind. Sometimes you need to adjust it to zero the sights as well. Most of the time they are pretty well centered but sometimes not. Any windage adjustments would be on top of the adjustments done for sight alignment. |
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