Some P2K and P2KSK are out there with magazine disconnects to keep them from firing without the mag. I do not know if this was ever offered on the USP/C or not but most do not have the MD. It is easy enough to test. Unload the pistol, make double sure nothing is in the chamber, remove the mag, cock the hammer, take off the safety, and pull the trigger. If the hammer falls there is no magazine disconnect.
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