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Wiktionary
unrifled

a. (context firearms English) Having a bore with a smooth interior, i.e. one that has not been rifled

WordNet
unrifled

adj. of a firearm; not having rifling or internal spiral grooves inside the barrel [syn: smoothbore] [ant: rifled]

Usage examples of "unrifled".

I am stripping our artillery of all the smooth-bore, unrifled cannon that can be found.