In full "Martini–Henry rifle" (occasionally "Martini–Henry carbine"). A rifle combining a breech mechanism invented by Martini with a ·45-calibre barrel incorporating a rifling system devised by Henry, used in the British army from 1871 to 1891.
The rifle was widely used outside the army for sporting and target shooting, and continued to be manufactured in Britain until the mid 1980s.
Mid 19th century; earliest use found in Naval & Military Gazette. From Martini + Henry.