I’d like to know what kind of .40 cal he had that goes off that easy. Neither of mine have that issue. I whack them pretty good at the range to test them. I’m kind of surprised we don’t hear about things like this more often.
I’ve seen Hi-Point semiautos go off like that. Friend of mine had one that if you swapped out the mag with one in the pipe and slammed the new mag home with your palm like you’re supposed to, it would discharge. Not the only one I’ve seen with “impact sensitivity” either.
The 'Glock 40' will when it slips out of the holster and the owner makes a grab for it before it hits the water.
(Note: Glock 40 are only recommend for those professional enough...nevermind)
Any double action only automatic without a dedicated safety will do the same.