Mastering Your Glock: Slide Lock vs Hand Rack, is one wrong?

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LOADING AND FIRING
1. The magazine is filled by each individual round being pushed into the magazine from the front, with the base of the round being pressed down first against the pressure of the magazine spring. If using the factory supplied loading support, slip support over the magazine and place magazine on a solid surface. Hold loading support firmly and place thumb on top of loading device: Press down loading device against tension of magazine spring and, while keeping support down, insert a round as far as possible. While pressing round downwards, slide support upwards (release magazine spring) and the round will slide into its rest. Repeat operation for subsequent rounds.
2. Introduce or insert the magazine into the magazine shaft until the magazine catch engages fully
3. Pull back the slide with free hand, and allow it to spring forwards into the final position. The trigger finger of the shooting hand remains outside the trigger guard. The weapon is now secured and ready to fire.
4. After the last round has been fired, the slide remains open. Remove the empty magazine from the weapon by pushing the magazine catch (19). Insert a new magazine and then either push the slide stop lever (27) downwards (see photo), or pull the slide slightly backwards and allow it to spring forwards. The weapon is now again secured and ready to fire.