smoothbore

Having no rifling within the barrel. Used of a firearm.

A firearm having no rifling.

Smooth-bored; not rifled: as, a smooth-bore gun. Compare choke-bore.

A firearm with a smooth-bored barrel; in contradistinction to rifle, or rifled gun.

Having a bore of perfectly smooth surface; — distinguished from rifled.

having a bore with a smooth interior, ie. one that has not been rifled

a cannon, gun or other firearm that has an unrifled barrel.

of a firearm; not having rifling or internal spiral grooves inside the barrel

a firearm that has no rifling