1. To cycle the slide of a semi-automatic gun. Usually refers to the procedure of operating a handgun where complete cycling of the slide ejects an empty cartridge case (if present) from the chamber, while moving a new cartridge from the magazine into the chamber. This action basically clears the chamber of an existing empty, or full, cartridge and prepares the gun for firing a new cartridge. Repeated ‘racking’ of the slide will eventually empty the gun of all cartridges. Racking the slide is also used to clear jams or malfunctions. On the range, or in a competition, a command to rack the slide may be used in a couple of different circumstances. When a semi-automatic gun is first loaded, the slide must be racked to load a cartridge into the chamber so the gun is prepared to fire. Second, a range officer may issue a rack the slide command when shooting is finished to verify that a gun is empty.
2. Ummm. This should describe it…