chokebore

chokebore [chohk-bawr, -bohr] Word Origin noun

1. a bore in a shotgun that narrows toward the muzzle to prevent shot from scattering too widely.
2. a shotgun with such a bore.

Origin of chokebore First recorded in 1870–75; choke + bore2 British Dictionary definitions for chokebore chokebore noun

1. a shotgun bore that becomes narrower towards the muzzle so that the shot is not scattered
2. a shotgun having such a bore