TYPE: Light machine gun
PLACE OF ORIGIN: France
IN SERVICE: 1916 to 1944
USED BY: France, United States, Poland, Belgium, Serbia, Romania

The Chauchat (pronounced 'show-shah') was a light machine gun used mainly by the French army but also by seven other nations, including the USA, during and after World War I. More than 260,000 were produced, making it the most widely manufactured automatic weapon of World War I.

Type: Heavy Machine gun
Place of origin: Russian Empire
In service: 1910 to 1943
Used by: USSR

The PM1910 (Maxim machine gun 1910) was used by the Russian army during World War I. It was an extremely heavy item and perhaps its only advantage was its water-cooled barrel, which enabled the weapon to produce sustained volleys of fire.

TYPE: Medium machine gun
PLACE OF ORIGIN: United Kingdom/Commonwealth
IN SERVICE: 1912 - 1968
USED BY: United Kingdom, Commonwealth:

The Vickers machine gun or Vickers gun refers to the water-cooled, .303 inch machine gun originally produced by Vickers Limited for the British Army. It typically required a six- to eight-man team to operate it: one to fire, one to feed the ammunition, and the rest to help carry the weapon, its ammunition and spare parts. The gun had a reputation for great solidity and reliability.

TYPE: Light machine gun
PLACE OF ORIGIN: United States
IN SERVICE: 1916 - 1944
USED BY: UK, Commonwealth, Belgium, United States

The Lewis gun is a pre-World War I machine gun of American design that was most widely used by the forces of the British Empire. It was first used in combat in WW I by the Belgians, and continued in use right through WW II. It is visually distinctive because of a wide tubular cooling shroud around the barrel and top mounted pan magazines.