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What happens with an auto loader is, after a round is fired, the mechanism automatically extracts, ejects, and reloads the chamber without any further action by the shooter.
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I can't think of anything to add to this.
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The most obvious thing I can think of is that a revolver retains the fired cases in the cylinder...
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Not only is there no ejection, in a revolver, the action is cycled by the shooter, either using the trigger in a DA design, or by cocking the hammer in an SA design. The chambers are also loaded by the shooter.
Revolver.
- Shooter manually loads the chambers.
- Shooter manually cycles the action (rotates the cylinder) either by cocking the hammer or by pulling the trigger.
- Shooter manually unloads the chambers/ejects spent casings.
Semi-automatic.
- First round is loaded manually either by cycling the action or dropping the bolt/slide.
- Subsequent rounds are loaded from the magazine by the energy of recoil, or the pressure of gas, from discharge.
- The action is cycled by the energy of recoil, or the pressure of gas, from discharge.
- Spent casings are ejected by the energy of recoil, or the pressure of gas, from discharge.