That is fascinating and certainly enlightening, but it doesn't bolster the uncited statement in this article that the SIGs broke their frames in testing.  Though I wouldn't be surprised that something was going on under the table with the Berettas, I was in the military when we did the switch from the old 45s to the 9mm, and the 9mm was a troublesome, finicky weapon not suited for most of the environments that we had to use them in.  The 45 might not have been pretty, but it would take a lot more abuse than the Beretta would and keep firing.  But that's neither here nor there, my only contention is that there's an uncorroborated statement in this article that nearly the opposite is reflected in other articles.