Glock 19
When you first pull the slide back to load the gun, the slide opens for the top round in the mag into the chamber, and when releasing the slide, it pushes that top round in to the chamber.
A press of the trigger then releases the firing pin wich strikes the primer, the substance inside the cartridge is then ignited, and turn into gas with a lot of energy, the bullet is then launched through the barrel and the energy is diverted back to the slide, pulling it back.
An extractor pushes out the empty cartridge and the slide is pushed back by a spring, loading the next bullet.
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