You can always make your pistol more suitable for your needs and more enjoyable to use by making small adjustments. Due to the simplicity of the Glock's design, the gun's slide is a popular target for customization. Glocks have metal rails on the frame that the slide may be mounted to. The pistol's slide makes a reciprocating action when fired. When the slide is retracted, an empty case is ejected by the extractor, and when the slide is advanced, a round is removed from the magazine and chambered. Altering the look of your weapon and increasing its effectiveness are both possible by modifying the slide of your Glock.