A chamber that has grooves cut in the chamber wall to assist or retard cartridge case extraction (e.g., Russian Tokarev semiautomatic rifle and the Heckler and Koch model HK4 pistol).
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A chamber that has grooves cut in the chamber wall to assist or retard cartridge case extraction (e.g., Russian Tokarev semiautomatic rifle and the Heckler and Koch model HK4 pistol).
1