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Semi-automatic pistols

The next development in handgun history after a practical revolver was the development of the semi-automatic pistol, which uses the energy of one shot to reload the chamber for the next. Typically recoil energy from a fired round is mechanically harnessed; however, larger calibers may also be gas operated (e.g. Desert Eagle). After a round is fired, the pistol will cycle, ejecting the spent casing and chambering a new round from the magazine, allowing another shot to take place immediately.

Some terms that have been, or still are, used as synonyms for "semi-automatic pistol" are automatic pistol, auto pistol, autoloader, self-loading pistol and self loader.

Compact semi-automatic Smith & Wesson .45 ACP Chief's Special — Model CS45.

Walther P99, a semi-automatic pistol from the late 1990s.