OK, it's SEMI first hand.
I was working in the gunshop when a man came in with an EARLY aluminum-framed 92.
Said he picked it up in Europe when he was in the military in the late 1970s, and had fired, to the best of his record keeping, over 600,000 rounds through it.
I'd say that his count was accurate, because he was a heavy-duty regular in the range, and was always shooting the Beretta.
The total number I can't vouch for, but the gun certainly looked like it had been fired that much. Virtually ALL the finish was gone from the grip frame, and the slide wasn't in much better shape.
He took the gun apart to show me what was going on...
The very front part of the frame (looks like a trough) had a 1/2" split in it.
There was another crack in the frame on the right side extending about 1/4" of an inch back from the slide lock hole.
The locking block itself was no longer smooth faced. It had a distinctive half-moon shape from where the barrel lock stem had been hitting it.
I don't know what they're called, but the slide rail lugs were pretty badly battered.
There was some other stuff also going wrong with it.
The end result was that the base frame was pretty much trashed.
He eventually ended up buying ANOTHER Beretta 92.