The Martini-Henry was a breech-loading single-shot

Single-shot

Single-shot firearms are firearms that hold only a single round of ammunition, and must be reloaded after each shot. The history of firearms began with single-shot designs, and many centuries passed before multi-shot designs became commonplace...

 lever-actuated rifle

Rifle

A rifle is a firearm designed to be fired from the shoulder, with a barrel that has a helical groove or pattern of grooves cut into the barrel walls. The raised areas of the rifling are called "lands," which make contact with the projectile , imparting spin around an axis corresponding to the...

 adopted by the British

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

, combining an action worked on by Friedrich von Martini (in certain respects resembling, and sometimes claimed to be based on, the Peabody rifle

Peabody action

The Peabody action was an early form of breechloading firearm action, where the heavy breechblock tilted downwards across a bolt mounted in the rear of the breechblock, operated by a lever under the rifle. The Peabody action most often used an external hammer to fire the cartridge.The Peabody...

 developed by Henry Peabody), with the rifled barrel designed by Scotsman Alexander Henry

Alexander Henry (gunsmith)

Alexander Henry was a Scottish gunsmith, based in Edinburgh, and designer of the Henry rifling used in the Martini-Henry rifle.He submitted a rifle to the competition organised by the British government for a replacement to their existing Snider-Enfield service weapon. The government did not...

. It first entered service in 1871 replacing the Snider-Enfield

Snider-Enfield

The British .577 Snider-Enfield was a type of breech loading rifle. The firearm action was invented by the American Jacob Snider, and the Snider-Enfield was one of the most widely used of the Snider varieties. It was adopted by British Army as a conversion system for its ubiquitous Pattern 1853...

, and variants were used throughout the British Empire

British Empire

The British Empire comprised the dominions, colonies, protectorates, mandates and other territories ruled or administered by the United Kingdom. It originated with the overseas colonies and trading posts established by England in the late 16th and early 17th centuries. At its height, it was the...

 for 30 years.