On the tv show Sons of Guns, the daddy test fired a Thompson they were rebuilding which continued full auto after he’d released the trigger. Not slam fire, malfunction. in my experience as an IDPA range officer, I’ve seen slam fires in mini 14’s and SKS’s. I’ve seen several FTF’s where the primer was dented. Cooper was sufficient in all these cases.
OTOH, observing a squib... and praying the shooter heard you shout STOP is a real wakeup.
Shoot fast. Shoot straight. Shoot safe.
Practice. Carry. Glock rocks.
btw that was sacrilege what they did to that Thompson