The invention relates to a firearm, comprising: a housing (1) having a barrel (2) arranged therein; a magazine, which can be inserted into a receptacle of the housing and which has cartridges; a breechblock (3), which can be moved relative to the housing (1) in the longitudinal direction of the barrel (2), for conveying cartridges out of the magazine into a cartridge chamber (4) located in the housing, and for conveying cartridge cases (5) from the cartridge chamber (4) to an ejection port (6) after a shot has been fired. An extractor (8), which is connected to the breechblock (3) and is preloaded in the direction of the cartridge case (5) by means of a spring (7), and an ejector (9), which is likewise connected to the breechblock (3), are provided for the ejection of the cartridge cases (5). The ejector (9) is arranged in a cylindrical ejector seat (10). The extractor (8) is arranged on an extractor seat (11), which is arranged for pivoting about the ejector seat (10). The extractor seat (11) can be fastened at different positions along the pivoting path in order to adjust the ejection direction of the cartridge cases (5).