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Posted: 3/30/2013 5:53:59 AM EDT
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Just got a new Trijicon Acog. Mounted it last night and noticed that the horizontal sight line is not parallel to ground. It is like the airplane wings when in a right turn, left wing high, right wing low. I would guess there was a 10 degree rotation. Everything was tight.
I tried to hold the body of the Acog while tightening the screws and while better not quite perfect and I doubt I could ever just take the Acog off and put back on with holding a zero. Is there method or product that can help in this situation? This is a new Acog with zero rounds fired and I have not found anything abnormal with the rail or mounting block on the Acog. Thanks. |
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There is no problem with the optic, it is a mechanical problem. I can get the cross hair level, it goes out of level when I tighten the screws down to affix to the rail. The cross hair and sight lines are not moving independent of the Acog body. There must be some method to account for the tolerances during mounting to the top rail when tightening the screws down.
Thanks. |
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What about the vertical line, is that also crooked or is it just the horizontal lines? Due to the prismatic design of an ACOG there will be some parralax error on the horizontal lines as you move your head around behind the optic. However the vertical line with the bdc is parralax free so it is not dependent on a good head position. So for this type of optic it is completely normal as you move you head up and down behind the optic to see the vertical line remain perfectly stationary while the horizontal line will have some rotation back and forth.
I'm not sure if that is the issue you are having or not. It may be that your prism is out of alignment. If what you are seeing is different from what I am describing than you should give Trijicon a call. |
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I am using the TA51 that came with the Acog mounted on picatinny rails. The cross hairs remain perpendicular to each other regardless of orientation.
I can hold the body of the Acog and get it mounted to almost perfect when tightening the screws down. I also am not over tightening them. However if I don't hold the body and allow the Acog to self align as I tighten down, the cross hairs go about 10 degrees off. Or another way to put it, the body of the Acog tilts as I tighten it as evidenced from the cross hairs being 10 degrees off axis from ground. Thanks in advance. |
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Take a picture of the mount and then one of the upper you are trying to mount the Acog to.
Something sounds crazy here. It's not a weaver style base you are trying to put the acog on is it? I just mounted my Acog and there is no way it cocks to the side or does as you descibe. A picture would be nice. |
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Rotate it in the mount and try it. ACOGs don't rotate in their mount. The housing isn't like a traditional rifle scope. i think he means to remove the acog from its mount, turn the mount around 180 degrees, reassemble, and then mount it to the rifle this time the thumb screws will be on the opposite side. Then observe if the perceived cant is the same or opposite. |
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Quoted:
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Rotate it in the mount and try it. ACOGs don't rotate in their mount. The housing isn't like a traditional rifle scope. i think he means to remove the acog from its mount, turn the mount around 180 degrees, reassemble, and then mount it to the rifle this time the thumb screws will be on the opposite side. Then observe if the perceived cant is the same or opposite. Ah....didn't think of that. |
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Quoted: Quoted: Quoted: Rotate it in the mount and try it. ACOGs don't rotate in their mount. The housing isn't like a traditional rifle scope. i think he means to remove the acog from its mount, turn the mount around 180 degrees, reassemble, and then mount it to the rifle this time the thumb screws will be on the opposite side. Then observe if the perceived cant is the same or opposite. Yes, that's what I meant. I could have said it better, I was in a hurry to post. |
| My new Acog is going back for the same reason. For a 1k optic, you think they could get the reticle straight, or at least do a better job with the mount. The sight channel is also drilled way off center. Maybe Trijicon is just pushing some junk out the door right now? |
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My new Acog is going back for the same reason. For a 1k optic, you think they could get the reticle straight, or at least do a better job with the mount. The sight channel is also drilled way off center. Maybe Trijicon is just pushing some junk out the door right now? I've honestly never seen this issue in the 100's of ACOGs i've handled. |
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