So I picked up a Nordic Components mag tube extension and clamp for my 930 since they seem to be highly recommended. However, upon installation, I end up with this mess. It seems they don't test fit any of their stuff before it leaves the factory. I've tried flipping the clamp around, etc, but no matter what the clamp only touches the barrel at two very small spots (as indicated by the arrow) when installed the only way it will line up properly. Is this off and I just got a bad one? I sure hope so, as is that clamp is all but useless to reinforce the mag tube.
