Originally Posted by
SA80Dan
One of my ARs has the rear sight well over to one side, but if that's where it needs to be to be zeroed, so be it, the adjustment range is there for a reason.
That said...I know on mine what the cause is (and it might be the same for you has your front sight is on a free float rail) - my receiver face is not completely true as when I look at the rifle from the front I can see the barrel is very marginally closer to one side of the rail than the other. Ive got a tool to true the receiver face up but haven't gotten around to it yet. It's not that it *really* needs doing as the irons on that rifle are accurate as adjusted, it's more my OCD...
On your rifle you might also check for how exact the rail rail is mated to the one on top of the receiver.... if it's slightly misaligned that will throw the sight over too.
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