The X-GRIP adapts the HK P2000 magazine for use in the P2000SK incorporating the larger magazine into the P2000SK's grip, and increasing the gun's capacity to 13 rounds in 9mm and 12 rounds in .40 cal. Simply slide the X-GRIP over the magazine until it firmly seats against the floorplate.FeaturesWorks with 9mm, .40 S&W, and .357 Sig