<P> Additional terms sometimes used as synonyms for a semi-automatic pistol are automatic pistol, self - loading pistol, autopistol, and autoloading pistol . </P> <P> A semi-automatic pistol harnesses the energy of one shot to reload the chamber for the next . After a round is fired, the spent casing is ejected and a new round from the magazine is loaded into the chamber, allowing another shot to be fired as soon as the trigger is pulled again . Most pistols use recoil operation to do this, but some pistols use blowback or gas operation . </P> <P> Most types of semi-automatic pistols rely on a removable magazine to store ammunition before it is fired, usually inserted inside the grip . </P> <P> Semi-automatic pistols use one firing chamber that remains fixed in a constant linear position relative to the gun barrel . In contrast, although double - action revolvers can also be fired semiautomatically, their rounds are not fired from a single chamber, but rather are fired from each of the chambers that are rotated into linear alignment with the barrel's position in turn just prior for each shot fired . </P>

Where is the magazine located in a typical semi-automatic pistol
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