Wait...those aren't supposed to just fall out?
I've had at least a half dozen different 92/96 models...I think all but one the locking block would easily remove by hand (if not come out on its own). Didn't matter if they were Italian or U.S. made, or if new or well-used.
Speaking of the pin, I thought roll pins were supposed to be single use, but the Beretta video has the same one going back in. I guess some rollpins are re-usable?