Let us know how it turns out. I would be curious to know the origin of the problem.
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If everything is level and you were able to zero your rifle than you are fine. When I recently zero'd my Centurion Arms 14.5 middy using a Troy rear I had to adjust 6 clicks to the right from mechanical zero to get my zero centered. Not all rifles zero equally some need more adjustment than others.
I've had similar issues with polymer sights. Hate having to swap them around till I find one that suits a particular barrel but, customers want what they want and not what I'd like to see them use.
If you can get an LMT A2 NM rear sight or a NM grade carry handle you will be able to see definitively if it's the barrel or the rear sight.
I just installed Magpul sights on my 6920 and they zeroed in the exact same way, to the left. I just installed a Centurion 12" about a month ago. Had the rear sight for a while and used it with the A2 front sight. Everything lined up just a click or two off center, don't remember which side. Changed the handguard and installed front sight and it is adjusted way to the left just like the OP has in his picture. Glad mine ain't the only one. Still works just fine.
kenken
Glad to hear that others have the same issue with, what would seem to me to be, excessive windage.
A while back I completed my first upper build with a Noveske 16'' barrel, and I'm having to move the rear aperture pretty far to the right (further than I recall ever having to shift it before). Being my first build, I was a little nervous that I had somehow screwed up when installing the barrel.
I wonder, though, what would be the primary cause of this? Would it be an anomoly in my sight picture, or could some barrels just behave differently (or both)? I'm able to zero it so I'm not too concerned, but just curious now.
I went to the range with a buddy who has a new Stag Model 1 to sight in. I used his carry handle to check to see if it made any difference. It made none. With the Stag carry handle I needed 20 clicks of left windage to center shots at 100 and 200 yds. I put the magpul back on and needed 21 clicks at 200 yds. His Stag need 2 clicks left of center for a 200 yrd zero. After seeing the how centered the Stag was, I'm inclined to think the front sight is canted. :mad:
I'll see what the manufacture says...
It must be canted a bit. Have you loosened your barrel nut and tried to rotate the barrel a bit? It might just be a degree or two, but I've seen where you can seat the barrel and it rotate a bit in the upper.
I am a believer that all barrels react or behave differently. That's the reason we sight them in. Because if they were all the same the manufacturer would have them sighted in for you from the factory or give you the exact number of clicks to have it zero'd out of the box. Just my .02