Final answer:
Semi-Automatic (or Autoloading) Action refers to a type of firearm action that automatically loads and fires a round with each pull of the trigger, but requires the shooter to manually chamber the first round. Semi-automatic actions are commonly found in handguns, rifles, and shotguns.
Step-by-step explanation:
Semi-Automatic (or Autoloading) Action refers to a type of firearm action that automatically loads and fires a round with each pull of the trigger, but requires the shooter to manually chamber the first round. Unlike fully automatic firearms, semi-automatic firearms cannot continuously fire as long as the trigger is held down. Instead, each pull of the trigger fires one round. Semi-automatic actions are commonly found in handguns, rifles, and shotguns.
An example of a semi-automatic firearm is the popular AR-15 rifle. When the trigger is pulled, the fired casing is ejected, and a new round is automatically loaded from the magazine into the chamber. The shooter can continue firing by pulling the trigger for each subsequent round.