Originally developed for the U.S. military's next generation handgun competition the HK45 Tactical comes standard with a threaded barrel and Meprolight three-dot tritium night sights. The HK45T's contoured and radiused slide has grasping grooves and anti-glare longitudinal ribs to make operation easier. The ergonomic grip has replaceable grip panels, which allow users to adjust the feel and grip circumference of the weapon to suit individual hand size and shooting preference. An HK proprietary internal mechanical recoil reduction system reduces the recoil forces affecting the weapon and shooter by as much as 30%, improving shooter control during rapid firing and prolonging component service life. An "O-ring" on the threaded barrel means better slide-to-barrel lockup and enhanced accuracy. An integral MIL STD 1913 picatinny rail is molded into the polymer frame dust cover for mounting lights, laser aimers, and other accessories.