I agree. Terrible design.Serbu has posted a new youtube video yesterday. He is now saying that to blow that breach cap off is 161k+ psi.
https://www.youtube.com/watch?v=na1Qo7FxDeM
He's going with the "there is nothing wrong with my design" approach.
He is saying that it was a 'counterfeit' slap round. He apparently still does not have the rifle or ammo.
He does not at all address the plain fact that the shooter received all the energy when the system failed, regardless of the cause.