Sten

Sten
Name	Sten
Caption	British 9×19mm submachine gun
Origin	United Kingdom
Type	Submachine gun
Service	1941–present (various)
Used by	United Kingdom, Soviet Union, United States, France, Poland, Yugoslavia, Israel, Canada, Australia, others
Designer	Reginald V. Shepherd, Harold Turpin, Major R. C. Stevens
Design date	1940–1941
Manufacturer	Royal Ordnance Factories, Birmingham Small Arms Company, Enfield, Electro-Tools Ltd
Production date	1941–c. 1945 (mass production)
Number	~4,000,000
Weight	2.1–3.2 kg (varies by model)
Length	760 mm (approx. for Mk II)
Cartridge	9×19mm Parabellum
Caliber	9 mm
Action	Blowback, open bolt
Rate	500–600 rounds/min
Velocity	~380 m/s
Feed	32-round detachable box magazine, 50-round drum (occasional)
Sights	Iron sights

Sten is a British 9×19mm Parabellum submachine gun developed and mass-produced during World War II to arm British Army and Home Guard forces, resistance movements, and allied irregular units. Characterized by simplistic stamped-steel construction and a side-mounted magazine, it was designed for rapid manufacture by firms such as Birmingham Small Arms Company and Royal Ordnance Factories. The weapon's low cost and ease of production made it ubiquitous across European Theatre of World War II, the North African campaign, and numerous postwar conflicts.

Etymology and Origins

The name derives from designers and institutions associated with its conception: initials of Reginald V. Shepherd and Harold Turpin together with the letter N referring to Enfield or Royal Small Arms Factory. Development accelerated after the Norwegian Campaign and the evacuation of Dunkirk, when shortages prompted officials in War Office workshops and private contractors to seek an expedient 9 mm submachine gun. Early prototypes drew on lessons from captured German MP 40 examples and contemporary designs such as the Thompson submachine gun and Suomi KP/-31, but prioritized stamped components similar to work by Soviet Union factories and manufacturers like Vickers-Armstrongs.

Design and Technical Specifications

The weapon employed a simple blowback action firing from an open bolt, chambering the widely used 9×19mm Parabellum cartridge adopted by Royal Air Force and British Commons procurement. Construction utilized stamped-sheet steel receivers, tubular receivers, welded buttplates, and a side-mounted magazine housing compatible with MP 40 and domestic box magazines. Typical specifications for the Mk II include a cyclic rate around 500–600 rounds per minute, muzzle velocity near 380 m/s, and iron sights graduated for close-range engagements. Safety features were minimal: a basic grip safety or bolt hold-open notch on some marks, with many early production runs lacking sophisticated safeties found on contemporaries such as the Sturmgewehr 44 or M1928 Thompson. Variations in barrel length, cooling slots, and stocks produced differences in weight and balance across models manufactured by firms including Enfield, Electro-Tools Ltd, Birmingham Small Arms Company, and assorted private workshops.

Service History

Adopted officially by the British Army in 1941, the weapon entered service in time for major operations across North Africa Campaign, Sicily Campaign, the Italian Campaign, and the Normandy landings in 1944. Issued to regular infantry, airborne units, Home Guard, Special Operations Executive, and resistance networks in France, Belgium, and Norway, it saw extensive clandestine parachute drops coordinated with SOE and OSS liaison. Captured examples were used by Wehrmacht forces and modified by German resistance groups; postwar, surplus weapons proliferated to Polish Armed Forces in the West, Yugoslav Partisans, and nascent states such as Israel during the 1948 Arab–Israeli War. Continued use persisted into the Cold War by irregular forces in Korean War theaters and various insurgencies due to the abundance of wartime production.

Variants and Modifications

Standard series included Mk I, Mk II, Mk III, Mk V, with specialized versions such as the Mk IIS silenced model developed for Special Operations Executive and clandestine operations. Improvised and foreign-produced variants emerged in occupied Europe and postwar states: homemade copies in France, Poland, and Czechoslovakia; clandestine manufacturing by Soviet partisans and workshop-built models in Yugoslavia; and licensed adaptations by firms in Canada and Australia. Field modifications included shortened barrels for paratroop use, welded stocks, magazine wells adapted for MP 40 drums, and crude suppressors for SOE missions. An array of magazine types, from 32-round box magazines to 50-round drums derived from Suomi KP/-31 practice, further diversified operational capability.

Combat Use and Tactical Impact

The firearm's compactness, simple maintenance, and high rate of fire suited close-quarters combat in urban operations such as the Battle of Arnhem and street fighting in Warsaw Uprising, where British airborne forces and resistance fighters relied on reliable, if crude, small arms. Its low cost enabled mass distribution through supply chains including Lend-Lease and clandestine drops by RAF Bomber Command and SOE, shifting small-unit tactics toward increased automatic fire at squad level akin to trends seen with the German MP 40 and Soviet PPSh-41. Drawbacks—magazine wobble, accidental discharges, and variable accuracy—prompted tactical doctrines emphasizing burst fire, close engagement ranges, and use as support weapons aboard armored vehicles or in trench raids during Italian Campaign operations.

Cultural and Political Influence

Beyond battlefield roles, the weapon became an emblem of resistance in occupied Europe and a symbol in postwar popular culture, depicted in films about World War II, documentaries produced by BBC Television, and literature recounting SOE operations. Its proliferation affected postwar armament debates in parliaments including the United Kingdom Parliament and influenced small-arms policies in emerging states such as Israel and India. Politically, the distribution of surplus models affected insurgent capabilities during decolonization conflicts in Algeria, Kenya, and Indochina, while collectors and historians in institutions like the Imperial War Museum and National Army Museum preserve examples that illustrate industrial improvisation under wartime exigency.

Category:Submachine guns Category:Firearms of the United Kingdom Category:World War II infantry weapons of the United Kingdom