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free-bored

[free-bawrd, -bohrd]
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adjective
  1. (of a rifle) having a bore that is not rifled within a short distance of the breech, so that a fired cartridge travels about 1/2 inch (1.3 cm) before being engaged by the lands, thus reducing initial high pressures.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018