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9/22/2017 12:11:25 AM
Posted: 12/30/2005 10:06:31 PM EDT

I've learned so much from reading (and searching the archives) of this site.

I have a couple questions about the TA31F. I just installed it today on an upper with a 16" mid-length, 1:7 twist, chromed lined, (one of Denny's Operator barrels).

I was 14" high at 85 yards using 55gr Winchester white box and 75gr Hornady TAP. My groups were around 1.5" with the Hornady.

My questions are:

1. Why am I 14" high at 85yds?
2. Will there be enough 'latitude' adjustment in the ACOG (TA31F) to compensate for approximately 14" at 100yds? The Trijicon manual says that the sight can be ruined by over adjusting beyond the limits of the adjustment boundaries.

Thanks for the help.

God Bless,

Link Posted: 12/31/2005 4:07:18 AM EDT
Link Posted: 12/31/2005 7:27:36 AM EDT

thats a bit much, i would check to see if the acog and mount are squared up properly before attemtping to adjust that much
Link Posted: 12/31/2005 8:48:20 AM EDT
My last few sight-ins with ACOGs have been pretty far off- off the paper at 100. They have tons of adjustment, so just start cranking. However!!! If you feel more resistance as you are turning the adjuster- STOP so that you don't cause any damage. Time to investigate your build if that is the case.
Link Posted: 12/31/2005 12:35:43 PM EDT
Ok, I'm feeling assured based on two of the three posts above. I was actually going to wait until Trijicon reopened so that I might call and talk with a tech before I started 'cranking' on the adjustment screws.

However, It seems like it is not uncommon to be so many inches off and the adjustment boundaries within the ACOG should have a generous amount of latitude to compensate. Thanks for the help.

I would be interested in knowing if anybody else has found their ACOGS to be ~14" off from the factory. Thanks again.

God Bless,
Link Posted: 12/31/2005 4:45:44 PM EDT
Link Posted: 12/31/2005 9:41:37 PM EDT
That's probably normal. When one guy in my company tried to zero his ACOG, they had to put a large sheet of paper up for him to get started. He wasn't hitting the zero target (only 8x11" though) at 25 meters. It was way off.
Link Posted: 1/1/2006 2:19:36 PM EDT
It states in the manual that, "The ACOG is shipped in a centered position for M16/AR15 carrying handles." Bold supplied.

I'm not 100% sure what that means, but I would suspect that if the TA31F is shipped sighted for carry handle use when of course it's meant for flat top use, that might be the reason why it is so far from zero out of the box.

God Bless,
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