lunde is correct in all he says, including the temporary factory production of nickel plated P7s of several types, though the P7M10 was the only one commonly so found.
On VHS, the gun held by Alan Rickmn in Die Hard appears to be a P7M8, but if gbelleh has DVD and says he can get a clear enough freeze-frame image to read the P7M13 letters on the slide, I am thereby informed.
The P7 is such an unusual gun that there's a database of movies in which it stars!
The official tally so far for
P7 appearances in films is as follows.
Easily recognized examples:
Die Hard
Wanted: Dead or Alive
True Romance
Under Siege
Armageddon
Great Expectations
8 Million Ways To Die
Wild Geese 2
The Adventures of Buckaroo Banzai Across the Eighth Dimension
The Bodyguard
Tomorrow Never Dies
The Dead Zone
The Mask
Snatch
Silence of the Lambs
Dogma
Visible only with DVD:
True Lies
End of Days
Eraser
Unconfirmed:
Mercury Rising, Judas Kiss
Honorable mention:
8 Heads In a Dufflebag (P7 appears on dust jacket)
(By reference to the Star Trek fans or "Trekkies" of the '70s, people who are silly enough to pick out P7 appearances in films are referred to as "Heckies". There's several threads on this at the Cult of The P7 forum over at Park Cities Tactical!)