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Being attached to the air tube, the lower rail will rotate with the tube if it unscrews. Since the air tube cannot be screwed "tight", any torque at all applied to a the rifle on a tripod causes it to cant. Early on the lower rail fixture was also around the barrel shroud. That would have...

Yes....that's why I say THE regulator. Both gauges read the same pressure after an overnight rest.

I recently bought an M4 new that arrived with the same problem. I was told the regulator needed to be replaced. It has spent more time out for repair than time shooting. It is out for delivery today with the third regulator. We'll see if that fixed the problem. I just find it a little difficult...