#bolt.bar  a sliding bar in a breech-loading firearm that ejects an empty cartridge and replaces it and closes the breech
  supertype:  bar.artifact  a rigid piece of metal or wood; usually used as a fastening or obstruction of weapon; "there were bars in the windows to prevent escape"
  part of:  rifle  a shoulder firearm with a long barrel and a rifled bore; "he lifted the rifle to his shoulder and fired"

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