Can anyone here conceive of a way the gun could have been sabotaged to fire without a normal trigger pull - say merely touching the trigger?
Could have been an old gun and just worn so it had a light trigger pull, when I used to Target shoot I would slick the metal up so when you cocked it your heartbeat would almost set it off...
But it looks like the gun would have to be adjusted for that to happen.
I think that's what Alec is implying without using the "technical" term.
Remember, we want him to be gun dumb.