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Posted: 1/28/2005 3:35:19 PM EDT
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I want to get a TA11 for my Colt 6920, it is a A3 with removable handle. I would like to remove the handle and mount the scope to the flattop. Today I called Trijicon they told me that I should get the TA11F with the cheveron reticle instead of the TA11 with donut reticle because I would never be able to zero it in. Trijicon said that the TA11 was designed to mount to a handle, I would really like to get the donut reticle. A friend of mine told me that it would be no problem to mount and zero a TA11 on a flattop. I would hate spend big $ and not be able to zero in. One other question: does the reticle ever get in the way when you are aiming just beyond the distance your rifel is zeroed for? Is the cheveron reticle better than the donut? I welcome any advice on this subject. Thanks |
Never be able to zero it huh  I had a TA11 donut (traded for a TA31F since) and used an ARMS 19S with it. Mounted on a Colt 20" flat top, it didn't even need adjustment when I shot it for the first time at the range. I don't know if the rep was trying to oversell you, but there is no problem with your original configuration! Paul of MSTN once showed an A3 receiver with ACOG mounting holes already drilled on the receiver, where an ACOG would mount directly to the upper receiver. On the opposite end of the spectrum, there are those with ARMS SIR which raises the height of the upper receiver rails, they too get their ACOGs to work. ETA gun porn  
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But I could be wrong there.
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You can get any ACOG to Zero on a Flat top. We have the TA11 and the TA11F in stock. www.csgunworks.com [email protected] Here’s some testimonials about CS GunWorks for AR15 Board Mike at CS Gunworks is... |
Here are some Pics of a TA11.   www.csgunworks.com [email protected] Here’s some testimonials about CS GunWorks for AR15 Board Mike at CS Gunworks is... |
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Don't you think the rep meant to say you would never get the BDC to zero the way it is suppose to unless it is on the carry handle? I for one had to do a little reasearch to find out that certain models BDC are designed for flattops and others are designed for carry handle mounting. FWIW |
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I have to believe that the rep was referring to the BDC capabilities rather than the possibility of zero'ing the scope/rifle combination at any particular distance. As Zak has correctly pointed out, bdc reticles are VERY approximate things when applied to any particluar rifle/ammo/atmospheric conditions combination. No matter which model of ACOG you get, you absolutely must shoot to determine where the bullets coming from YOUR rifle with YOUR ammo with YOUR scope mount where YOU shoot actually strike at various distances. Contrary to intuition, it is possible to shoot extremely accurately with the donut. I think most of us agonized over the choice of which ACOG to get for our own unique purposes. But, as it turns out, it's pretty much impossible to make a bad choice. No matter which model you end up with, you're gonna love it. Luck, SD |
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I guess that I do not get the difference between BDC and having your rifle Zero'd in for a specific distance. The TA11 is made to mount on a handle and the TA11F is made to mount on a flattop (mounting to a flattop is what I plan on doing). I understand that it is possible to zero in a TA11 on a flat top, but the BDC won't work properly?? Thank you for your help!! |
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When I was looking at ACOGs for one of my A3 uppers I found a TA31A (triangle). The TA31A is designed to be mounted on a carry handle & not a flattop, so I called Trijicon to see what their thoughts were. I talked to someone in their design shop (don't remember who) and he told me that they had just finished up some testing to answer the very question I was asking. Their testing demonstrated that the difference in POI between a TA31A on a carryhandle and on a flattop is about 0.8 MOA - less than the width of the black BDC line in your reticle. I can't imagine the TA11 would be much different than that. I would think the BDC would work fine, but as others have posted above, tiny changes in wind, elevation, etc. will change POI (though that would happen with any optic). If I were you I'd buy it, mount it, & shoot it. |
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John- The ACOG reticle has a primary zero point, e.g. you sight that point in at 100 yards. For the TA11/31, it's the top of the donut (at 100 meters technically). The BDC part of the reticle are the secondary aiming points BELOW the primary aiming point. They are intended to demark the hold-over required for shooting certain distances. The lines on the ACOGs are calibrated for certain loads out of certain barrel lengths, with a certain sight over bore distance, fired in particular environmental conditions. If any of those vary, the actual impact points beyond your primary zero will change. So you need to work out what you actual hold points are vs. the reticle BDC marks. hope this helps |
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