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Noun: breechblock  'breech,blók
  1. A metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing
    - breech closer

Derived forms: breechblocks

Type of: block, blockage, closure, occlusion, stop, stoppage

Part of: breech, rear of barrel, rear of tube

Encyclopedia: Breechblock