Real damage

[sheepherder]

With both ears being separated, I wonder if it is a case not of excessive charge but of a missing/broken/ out-of-position locking bolt [takedown lever]. In that case, the only part holding the barrel extension together would be the axle pin, which very well might break the barrel extension at the ears.

This would also explain the relatively unbroken parts that a double charge would normally break.

Maybe...