This is a cop out. It was designed a particular way and someone used it outside of those bounds.
We disagree
I believe in Murphy's law. If it can go wrong,it will. This case proves the point.
I have seen buttress thread type locking lugs on original Newton rifles.No place else have I seen 60 deg vee threads serving as the the locking surface.
Although,true,barrel to receiver threads are typically vee thread.
The breech cap is in the form of a cup. One end is open. The linear load on the threads ,by way of the vee,gets translated to a force that wants to open one end of the cup.
I don't pretend I know what happened. I don't even argue with the gun being subjected to abuse via the ammo.It DID fail. No matter how it failed, the breech cap becoming a projectile that nearly killed the shooter is unacceptable.
Its one thing if you hobby shop up your own gun and it blows up and kills you.
Its another if you are selling them. I'm curious how much "failure mode" testing was done. You know,"Crash test dummy" testing?
Maybe blow up 5 or 10 SERBUs with a watermelon for a shooter?
Were those "Ears" speculated to work or did they go through catastrophic testing? 5 or 10 times?
I get it ,the failure was not supposed to happen. But it undeniably DID happen. With near fatal results. You talk about "not fair" ? Thats not fair.
I'll agree,the ammo and chain of custody are unknown. It might have been dirty trick sabotage gun wrecking CIA ammo,
Its a bad design if the point of failure blows a hole in the shooters neck. Its not fair,