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Posted: 12/6/2015 8:38:44 PM EDT
| I recently bought a ta31f-g with flat top mount and when I went to zero it today I had some problems. In the manual it says they are factory zeroed so omly minor adjustments will be needed. I set my target at 100 meters and fired 8 shots and none of them hit paper. Moved target in to 50 meters fired another 8 and I didn't hit paper but hit the board way right. So I adjusted 10 clicks fired another 8 and hit paper still way right. Kept adjusting and shooting until I was dead center then moved target out to 100 meters again and my shots hit way high and right. I stopped there bc it was getting dark. Is this normal? Do I have a defective unit? Whats the adjustment tolerance? I don't want to end up breaking something by adjusting to much. BTW it's sitting on top of an aero precision m4e1 16 inch upper and aero lower. Also shooting 55 grain 5.56 just like trijicon used for this model. There's no operator error either, acog tight on rail and no jerking the trigger all shots were cutting other shots. Unless there's something else I'm doing wrong lol |
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Quoted:
I recently bought a ta31f-g with flat top mount and when I went to zero it today I had some problems. In the manual it says they are factory zeroed so omly minor adjustments will be needed. I set my target at 100 meters and fired 8 shots and none of them hit paper. Moved target in to 50 meters fired another 8 and I didn't hit paper but hit the board way right. So I adjusted 10 clicks fired another 8 and hit paper still way right. Kept adjusting and shooting until I was dead center then moved target out to 100 meters again and my shots hit way high and right. I stopped there bc it was getting dark. Is this normal? Do I have a defective unit? Whats the adjustment tolerance? I don't want to end up breaking something by adjusting to much. BTW it's sitting on top of an aero precision m4e1 16 inch upper and aero lower. Also shooting 55 grain 5.56 just like trijicon used for this model. There's no operator error either, acog tight on rail and no jerking the trigger all shots were cutting other shots. Unless there's something else I'm doing wrong lol https://www.ar15.com/archive/topic.html?b=3&f=18&t=560803 |
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The manual does not state they are factory zeroed. Unless they install an optic on your rifle at the factory, it is not possible to factory zero any optic on earth because each rifle shoots differently.
It is pointing out that the reticle is mechanically centered because some people like to get a new scope, run the adjustment all the way to the extremes, then come back halfway to center the reticle. Since running the ACOG to the extreme can break the adjusters, they are trying to prevent you from dorking it up. By stating it should only take minor adjustments, it is just referring to not having to make adjustments from one rifle to another. If the optic is installed on one rifle and it took 15 clicks left to center, then the optic was put on another rifle, and it needs 15 clicks right (from the centered position), you would have to put 30 clicks right on it to make up for both adjustments. By centering the reticle at the factory, you would only need to make the 15 click adjustment instead of the 30. It sounds like there is nothing wrong with your ACOG. Any time you zero at 25 or 50 yards, you are going to shoot high at the 100 yard line. When I zero dead center at 25 yards, my first rounds impact about 8 inches high at the 100 yard line. Also, keep in mind that when you are shooting at closer than the 100 yard line (actually, it should be meter line, but doesn't make a big enough difference to matter) you have to make more windage adjustments for the same change in impact. At the 100 yard line, if you shot four inches to the right, you would make 8 clicks left with a 1/2 MOA adjuster. At 50 yards, if you shot four inches to the right, you would have to make 16 clicks worth of adjustment. It sounds like your rifle was simply shooting a bit right and you just need to finish making adjustments. Don't let it frustrate you. It might seem like a lot of adjustment while you are doing it, but once you get a zero, you will be very happy with the optic. |
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The thought of attaching a new optic on my rifle and attempting to zero it at 100 yards makes me face palm..
I always start at 25, then 50, then 100. At every step, I have to fine tune it. All of my ACOGS and other scopes have to be adjusted from one rifle to another. It usually takes me about 10 shots (at 25 then 50) before I get on paper at 100. |
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