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Posted: 9/22/2014 8:50:11 PM EDT
You'd think the front sight would be visibly canted, but it's not.
My rail looks straight when compared to the reciever, as far as I can tell. The dot zeros fine (obviously.) The irons are KAC micros, and I have to max the rear to the left, and it's still not quite zeroed.. The only thing I notice as "off" is that the Centurion CMR rail is slightly off in dimension compared to the upper receiver, but I assume it's within "spec." - I took the sights off to make sure there wasnt any debris or anything under them. They're sitting flat. What am I not thinking of? *forgive my shitty cellpotato photos     |
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Posted: 9/22/2014 9:03:42 PM EDT
[#1]
Topic Moved
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Posted: 9/22/2014 9:15:04 PM EDT
[#2]
Had the same issue with my CMR. It was a problem with the barrel nut, which in my opinion is very poorly designed. I would check, with calipers the distance between the barrel and the inside of the rail at the front.
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Posted: 9/22/2014 9:23:46 PM EDT
[#3]
Quote HistoryQuoted: Had the same issue with my CMR. It was a problem with the barrel nut, which in my opinion is very poorly designed. I would check, with calipers the distance between the barrel and the inside of the rail at the front. For some reason, that hadn't crossed my mind... The gap between the rail and barrel is 0.377 on the right and 0.422 on the left. Bingo bango. That explains it perfectly. Did centurion help you out? |
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Posted: 9/22/2014 9:54:17 PM EDT
[#4]
.377 what? .422 what? What unit of measure?
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Posted: 9/22/2014 10:01:50 PM EDT
[#5]
Quote HistoryQuoted:
.377 what? .422 what? What unit of measure? Inches |
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Posted: 9/22/2014 10:22:20 PM EDT
[#6]
Quote HistoryQuoted: Inches Quote HistoryQuoted: Quoted: .377 what? .422 what? What unit of measure? Inches Yes, this. But, realistically, does it matter what unit? It's off center to the right, which would definitely cause my rear to be maxed left. |
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Posted: 9/22/2014 11:07:07 PM EDT
[#7]
How many ft lbs of torque did you apply to the barrel nut?
Does the barrel wobble? I think this issue may be related to your receiver and barrel extension. If the barrel but is not tight enough, your barrel may be sitting ever so cockeyed due to its interface with the face of the upper receiver. If you used plenty of torque, your receiver may need truing with a Brownells truing tool. If neither of those things are the issue, then I would be at a loss. |
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Posted: 9/22/2014 11:55:06 PM EDT
[#8]
Quote HistoryQuoted: How many ft lbs of torque did you apply to the barrel nut? Does the barrel wobble? I think this issue may be related to your receiver and barrel extension. If the barrel but is not tight enough, your barrel may be sitting ever so cockeyed due to its interface with the face of the upper receiver. If you used plenty of torque, your receiver may need truing with a Brownells truing tool. If neither of those things are the issue, then I would be at a loss. It's tight. The barrel/upper formerly had a TRX-Extreme Alpha mounted to a USGI barrel nut. The barrel sat perfectly centered in that tube, which was actually a little longer. |
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Posted: 9/23/2014 2:48:02 PM EDT
[#9]
Using the straight-edge, having checked the top of the picatinny rail, check the alignment of the picatinny rail from the rear-edge of the upper to the front-edge of the rail for the left and right sides. What did you find out?
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Posted: 9/23/2014 3:44:35 PM EDT
[#10]
Quote HistoryQuoted: Using the straight-edge, having checked the top of the picatinny rail, check the alignment of the picatinny rail from the rear-edge of the upper to the front-edge of the rail for the left and right sides. What did you find out? I guess theoretically the previous rail could've been crooked in the opposite direction of the receiver and thus balanced it out.
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