The HK P2000SK is a somewhat smaller version than the regular sized P2000.
The pistol is very similar to the USP Compact when closely compared to the USP. The P2000SK is equipped to chamber all of the rounds that the standard size P2000 can.
United States models of the P2000SK can be equipped with the somewhat longer USP Compact magazines. These magazines provide notably higher capacities. The higher capacity is up to 13 x 9mm and 12 x .40/357 SIG. Some of the pistol's smaller size may be compromised as the longer magazines protrude from the weapon about 1/2" below the bottom end of the P2000SK's pistol grip. The lower capacity maximum 10 round magazines were mandated by the Brady Bill in California despite the expiration.