#breech__rear_of_barrel__rear_of_tube  opening in the rear of the barrel of a gun where bullets can be loaded
  supertype:  #opening.artifact  a vacant or unobstructed space; "they left a small opening for the cat at the bottom of the door"
  part of:  #cask
  part:  #breechblock__breech_closer  a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing

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