What's unclear to me in combing this thread is whether the shooter is looking down the rib when the gun is fired. If the shooter has a "flat" picture in relation to the barrels, then the barrels should impact centered on point of aim. With this sort of "aim" of the barrels, if they then hit significantly off, the barrels themselves are at fault.

So, is it gun fit or barrel malfunction? If the latter, send the gun back to CSMC rather than bending in the full of the moon, etc.