The chamber is the inside wall of one end of the barrel, located on the opposite side from the muzzle. It is shaped to allow a cartridge to fit closely into it. On most semi-automatic pistols, it can be viewed through the ejection port when slide is held fully back against a compressed return spring. It is usually located above and forward (toward the muzzle) of the lips of the magazine. When the slide (or bolt) is "in battery" (fully closed) the chamber is immediately forward of the firing pin, though it cannot be directly viewed when the gun is in this condition.
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