[Kost]

Details courtesy TooSixy

• 1993 (KD): Original USP .40 and 9mm. USP40 came out first• 1994 (KE): Reduced the slide weight by 1.1 oz• 1994-95 (KE-KF): Changed to a polygonal rifled barrel (Prior barrelswere 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• 1995-96 (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 tomachined end on USP Compacts (not USPf)• 2005 (AF): Redesigned firing pin, firing pin block, and firing pinblock spring

 

[Kost]

Bought it! paid for an absolutely pristine USP45. It appears to have never been out of the case except for an initial oiling. I'm tickled.

Good on ya Scribe556!
USP Fullsize .45 is a fantastic pistol! Yes they are THAT good! Congrats!