#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  part:  breechblock__breech_closer  a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing

No statement uses or specializes breech; click here to add one.