Okay gents (I presumed there are no ladies on this post, please excuse me if I'm wrong
) I have been waiting to test your concern/not concern in a controlled environment. Test gun is my P10C with about 600 rds down range, nothing special.
***Please do not become another Darwin-award recipient if you don't reload***
I sized a few 9mm cases, primed them, and ONLY PRIMER in the sized case, no end cap, nothing that even close to a bullet. Basically a wide open mouth EMPTY CASE. Chambered the sized case that has only live primer. With safety glasses and ear pro. in, I pushed the muzzle of the P10C against a board with a hole drilled through (to relieve gas pressure). Back stop is basically the berm behind target stand. Proceeded to push the muzzle against this board until slide moved back and just before barrel unlocking, pulled the trigger and...Nothing! Just the slide being moved forward by the striker spring force. Yes it went 'click', but just the striker being released off the 'sear' plate but the striker blocking pin did not allow the striker to go forward. Repeat a few times with primed cases and again, nothing happened. Striker did not impact the live primer unless the slide is fully forward without any pressure against the muzzle.
There you have it. The striker blocking pin did its job.