The HK USP Compacts are smaller and lighter than large frame USP's. The reduction in trigger reach and grip circumference increases concealability and enhances shooting ergonomics. The USP Compact uses a narrow, full-hand grip frame with a choice of interchangeable extended or flush-fitting magazine floorplates. This makes the pistol easy to shoot without sacrificing concealability. To reduce the length of the slide and barrel on the USP Compact, the mechanical recoil reduction system found on large frame USP's has been replaced by a specially designed flat compression spring contained in the captive recoil spring assembly by a polymer absorber bushing. Service life is still engineered to exceed 20,000 rounds.