WordReference Random House Unabridged Dictionary of American English © 2020
free-bored  (frēbôrd, -bōrd),USA pronunciation adj. 
  1. Military(of a rifle) having a bore that is not rifled within a short distance of the breech, so that a fired cartridge travels about ½ in. (1.3 cm) before being engaged by the lands, thus reducing initial high pressures.

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