The 92F model was the original one the US Military chose in 1985 as the new service pistol after all the testing and evaluation was done. It has all the original required government spec features including the chrome lined barrel. See my earlier post with pictures. The military redesignated it the M9. As I understand it the slide issue appeared in several pistols during extensive Seal training using hot NATO SMG 9mm ammunition. The military then required the modification of the oversized washer mentioned in an earlier post. The new model designation was then the 92FS. I recall that Beretta recommends the locking block on the barrel be replaced after 20,000 rounds.
I have an Italian made 92F that I actually traded an AK for many years ago. I thought at the time I got the better end of the deal, but now I’m not so sure. I’m not sure mine has appreciated in value at all since I got it, and I can’t say that for many guns I own.
Larry