 Standard Hi-Powers are based on a single-action design.Unlike modern double-action semi-automatic pistols, the Hi-Power's trigger is not connected to the hammer.If a double-action pistol is carried with the hammer down with a round in the chamber and a loaded magazine installed, the shooter may fire the pistol either by simply squeezing the trigger or by pulling the hammer back to the cocked position and "then" squeezing the trigger.