We have established that open bolt MG's can fire when not fully cocked (who knew
)
I almost lost an eye on a M240 when a gunner opened the cover on a stopppage and had not ensured the weapon was fully cocked and did not hold the cocking handle to the rear when the cover was raised (thank god for oakleys)
Issue as I see it.
1) Instructor brought a non cleared weapon into a classroom
2) Non qualified Personnel where allowed to fiddle fuck it without supervision.
The ammo inserted and fired is somewhat non relevant -- AS IT NEVER SHOULD HAVE BEEN PRESENT IN THE FIRST PLACE.