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Discussion Starter #1
I tried the search button first and recall seeing something about this but for the life of me I can't seem to find it again. I have a 1995 USPf 9 and I would like to know if I have a old or a new firing pin. Can one tell the difference without tearing it down into little pieces?

Also have there been any worthwhile upgrades that I should have HK put in for me?
 

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Here is a list of USP upgrades/enhancements made to the line of USP pistols.

The information is collected by a member Big Bore and is published on the HKPRO boards.

1994 Reduced the slide weight by 1.1 oz.
Reason: improve reliability with training rounds and make gun easier to carry.

1994-95 Change to a polygonal barrel
Reason: Glock

1994-95 Change trigger transfer bar
Reason: Improve reliability in cold weather and dirty environments

1994-95 Change recoil guide rod to a "captured spring version"
Reason: Glock

1995 Change trigger mechanism.
Reason: Improve drop protection, reduce manufacturing costs, eliminate hammer over travel

1995-96 Add rubber spur to hammer
Reason: Required to pass some institution's drop test.
?? on date-change size of magazine release to current smaller button.
Reason: to prevent inadvertent mag releases?

1995-96 Change angle on slide lock
Reason: customers don't want slide to close automatically when a mag is inserted

2000 Add locking feature to hammer strut support:
Reason: attempt to pacify safety Nazis

2001 Converted captive recoil spring retainer from c-clip to
Machined end on Compacts.
Reason? C-clip prone to breakage on the Compacts.


2004 HK made the USP slide without the “HK” logo. Only “USP” on the left side and the text “Heckler & Koch” on the right side.

2005? Match hammer has a "D" cut in it. The match trigger kit now requires a new hammer catch and if not used will strike the firing pin when decocked.
Reason: ???

The catch part number is 219442. The new catch requires a new V1 hammer, part number 218571 (218570 complete). Looking at the pair (new catch and new hammer) in situ, the notch looks exactly like your match hammer notch and the catch fits nicely in the notch. Holding a LEM catch up to the new hammer (again, in situ) I believe the LEM kit includes the same new catch. I'll know for sure in a day or so when I get time to install the LEM kit.
Miku
 

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The firing pin design was changed sometime in the mid-2000s. My 2002 USP has an old style pin.
 
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