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FIREARM BARREL HAVING CARTRIDGE CHAMBER PREPARATION FACILITATING EFFICIENT CARTRIDGE CASE EXTRACTION AND PROTECTION AGAINST PREMATURE BOLT FAILURE
FIREARM BARREL HAVING CARTRIDGE CHAMBER PREPARATION FACILITATING EFFICIENT CARTRIDGE CASE EXTRACTION AND PROTECTION AGAINST PREMATURE BOLT FAILURE
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机译:配备枪膛室的FIREARMAR桶有助于有效的枪壳箱的提取和保护,防止螺栓过早损坏
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摘要
To permit ease and efficiency for the extraction of spent cartridge cases from the cartridge chamber of a firearm barrel within a wide range of temperature conditions, the internal tapered surface of the body region of a cartridge chamber is prepared by establishing circumferentially spaced longitudinal straight or curved regions of the internal surface finish to create an internal cartridge chamber geometry having gradually tapered spaced longitudinally relieved linear or spiral areas having longitudinal linear or spiral lands between each of the relieved areas. The circumferentially spaced lands develop controlled impedance to rearward cartridge case movement on cartridge firing to effectively protect the bolt and extractor mechanisms of the firearm against early failure.
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