USP date codes and key changes
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    Default USP date codes and key changes

    I'm looking at a USP .40 tomorrow.

    I see the date code is two digits, starting with A=0 thru K=9. So AK would be 2009, and BA would be 2010 and KK would be 99, if I understand correctly.

    With that in mind, I am aware there were some changes to the USP over time. Can anyone summarize those changes and when occurred, and any "preferred" periods of production/design?

    Edited: I found these two threads.
    https://www.hkpro.com/forum/hk-handg...ver-years.html

    https://www.hkpro.com/forum/hk-refer...-handguns.html

    From Toosixty on a thread:
    "Changes made to the USP series:
    • 1994 (KE): Reduced the slide weight by 1.1 oz
    • 1994-95 (KE-KF): Changed to a polygonal rifled barrel (Prior barrels were standard land and groove)
    • 1994-95 (KE-KF): Changed trigger transfer bar
    • 1994-95 (KE-KF): Changed recoil guide rod to a "captured spring version"
    • 1995 (KF): Changed trigger mechanism
    • 1995 (KF): Changed frame to allow new-design hammer axle and LEM conversion
    • 1995 (KF): Changed hammer strut
    • 1995 (KF): Changed one-piece catch to two-piece catch
    • 1995-96 (KF-KG): Added rubber spur to hammer
    • 1995-96 (KF-KG): Changed angle on slide lock
    • 2000 (AA): Added locking feature to hammer strut support (lanyard safety)
    • 2001 (AB): Converted captive recoil spring retainer from c-clip to machined end on USP Compacts (not USPf)
    • 2005 (AF): Redesigned firing pin, firing pin block, and firing pin block spring
    • 2005 (AF): Changed to longer catch and new hammer with the cut-out for the new catch"
    Last edited by leadcounsel; 05-23-2019 at 09:39 AM.

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    Quote Originally Posted by leadcounsel View Post
    I'm looking at a USP .40 tomorrow....With that in mind, I am aware there were some changes to the USP over time. Can anyone summarize those changes and when occurred, and any "preferred" periods of production/design?
    Well, it appears that a USP with an AF date code and thereafter would have all the upgrades built in. That would be the "preferred" periods you reference. But then again, it all depends on what you want in your USP.

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    Default USP date codes and key changes

    The firing pin, block, and spring can be swapped in 5 minutes and I think there was a safety justification around that. So really anything 95 or later should be good to go. There are significant differences in finish if you get a stainless steel slide, but other than that the only reason people would prefer a certain year is for sentimental reasons or so their 9/40/45s match.


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    I have a KF date code .45 (first year of 45), I prefer live fire to dry fire, so firing pin and block upgrades are not something it needs, it's been 100% reliable.

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    Quote Originally Posted by Kost View Post
    I have a KF date code .45 (first year of 45), I prefer live fire to dry fire, so firing pin and block upgrades are not something it needs, it's been 100% reliable.
    Same here, and agreed!!!

    Tony

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    Well it was a KF code, so '95 I believe. It was in rough cosmetic shape, obviously well worn surfaces, and sights were very dim. I passed.
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    Yeah, but... how much were they asking?

    A cosmetic condition is just that. Cosmetic.

    If the price were 'right' then, maybe??

    And I collect KH USP's
    leadcounsel likes this.
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    Quote Originally Posted by leadcounsel View Post
    Well it was a KF code, so '95 I believe. It was in rough cosmetic shape, obviously well worn surfaces, and sights were very dim. I passed.
    Cosmetic issues on the polymer frame is impossible to correct, no matter how one tries.

    This one was in beautiful condition with standard 3 dot sights, I just wanted something different but functional, so I went with hard chrome on the entire top end, including the barrel, TooSixy just installed it's 2nd set of Meprolight Green night sights.

    Last week I was hitting soda pop cans at 65 yards with it, it's incredibly accurate.



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    Last edited by Kost; 05-24-2019 at 02:54 AM.
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    Believe it or not, I still find things to add to this list. The latest one was "1996 (KG): Changed to redesigned disconnector".

    Here is the latest list.

    1994 (KE): Reduced the slide weight by 1.1 oz
    1994-95 (KE-KF): Changed to a polygonal rifled barrel (Prior barrels were standard land and groove)
    1994-95 (KE-KF): Changed trigger transfer bar
    1994-95 (KE-KF): Changed recoil guide rod to a "captured spring version"
    1995 (KF): Changed trigger mechanism
    1995 (KF): Changed frame to allow new-design hammer axle and LEM conversion
    1995 (KF): Changed hammer strut
    1995 (KF): Changed one-piece catch to two-piece catch
    1995-96 (KF-KG): Added rubber spur to hammer
    1995-96 (KF-KG): Changed angle on slide lock
    1996 (KG): Changed to redesigned disconnector
    1999 (KK): Added locking feature to hammer strut support (Lock-Out device) (starting in October 1999)
    2001 (AB): Converted captive recoil spring retainer from c-clip to machined end on USP Compacts (not USPf)
    2005 (AF): Redesigned firing pin, firing pin block, and firing pin block spring
    2005 (AF): Changed to longer catch and new hammer with the notch for the new catch
    bp1, Kost, leadcounsel and 1 others like this.

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    @TooSixy Awesome!
    "redesigned Disconnector". That's new.
    So, generally speaking, major changes during '94-'96, and major changes @ 2005 (excluding the lockout device and recoil spring clip).
    I wonder where the VP-Series will be, change-wise after ~25 years in service.
    leadcounsel likes this.

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