This is a standard 9x19 mm USP
fitted with the extended magazine well and 18 round magazines, as well as the
match trigger from the USP Expert. The
match trigger kit reduces the SA trigger pull from 20 N to 17 N and retains the
DA trigger pull at 50 N.
The USP pistols come in
calibers 9x19 mm, .40 SW and .45 ACP. There are also
aftermarket barrels in the caliber .357 SIG available.
Additional info on the various USP models can be found at
The Unofficial USP Homepage.