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The Besa machine gun was a British version of the Czechoslovak ZB-53 air-cooled, belt-fed machine gun (called the TK vz. 37 in the Czechoslovak army"TK" from ''těžký kulomet'' "heavy machine gun"; "vz" from ''vzor'' "Model").
The name came from the
Although British forces used the .303 in rimmed round for rifles and machine guns, the ZB-53 had been designed for the German 7.92×57mm Mauser round; referred to by the British as the 7.92 mm. The British had intended to move from rimmed to rimless ammunition but with war imminent, wholesale change was not possible. It was falsely believed by BSA and the Ministry of Supply that the industrial, technical and supply difficulty of converting the design to the .303 round would be more onerous than retaining the original calibre, especially given that the chain of supply for the 
The Mark II version, license-produced by BSA in Birmingham as opposed to ZB's Mk I, entered service in June 1940. The design was modified to be more rapidly and economically produced and three simplified models, the Mark II*, Mark III and Mark III*, entered service in August 1943. The Mark II* was a transitional model designed to use the new simplified parts but was compatible with the Mark II. All those versions had a selector to give a high rate of fire (750–850 rounds per minute) for close combat or focused targets or a low rate of fire (450–550 rounds per minute) for long-range combat or area targets. The Mark III and Mark III* versions did away with this selector and had simplified parts like the Mark II* but were incompatible with the Mark II. The Mark III had a fixed high rate of fire (750–850 rpm) and the Mark III* had a fixed low rate of fire (450–550 rpm) Damaged or malfunctioning Mark IIIs were converted to Mk III* at factories during repair.
The earlier wartime Mark I, Mark II and Mark II* versions of the Besa 7.92 mm were declared obsolete in 1951 and all Mark III versions were converted to Mark III*. The Mark III/2 introduced in 1952 was a conversion of the Mark III* with a new bracket and body cover. The later Mark III/3 introduced in 1954 was a conversion of the Mark III/2 that replaced the barrel and sleeve and made the gas vents larger on the gas cylinder to make it easier to use belts of mixed ammunition. The post-war Mark III/2 and Mark III/3 remained in service until the late 1960s.
The ZB-53, heavy machine gun model 37
– in Czech
Accessed 29 November 2007 * David Boy
Other British Tank Armaments
wwiiequipment.com 1 January 2009 *
Birmingham Small Arms Company
The Birmingham Small Arms Company Limited (BSA) was a major British industrial combine, a group of businesses manufacturing military and sporting firearms; bicycles; motorcycles; cars; buses and bodies; steel; iron castings; hand tool, hand, po ...
(BSA), who signed an agreement with '' Československá zbrojovka'' to manufacture the gun in the UK. The War Office
The War Office has referred to several British government organisations throughout history, all relating to the army. It was a department of the British Government responsible for the administration of the British Army between 1857 and 1964, at ...
ordered the weapon in 1938 and production began in 1939, after modifications.
It was used extensively by the armed forces of United Kingdom during the Second World War
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
as a mounted machine gun for tanks and other armoured vehicles as a replacement for the heavier, water-cooled Vickers machine gun
The Vickers machine gun or Vickers gun is a Water cooling, water-cooled .303 British (7.7 mm) machine gun produced by Vickers Limited, originally for the British Army. The gun was operated by a three-man crew but typically required more me ...
. Although it required a rather large opening in the tank's armour, it was reliable.
Development and use
Although British forces used the .303 in rimmed round for rifles and machine guns, the ZB-53 had been designed for the German 7.92×57mm Mauser round; referred to by the British as the 7.92 mm. The British had intended to move from rimmed to rimless ammunition but with war imminent, wholesale change was not possible. It was falsely believed by BSA and the Ministry of Supply that the industrial, technical and supply difficulty of converting the design to the .303 round would be more onerous than retaining the original calibre, especially given that the chain of supply for the Royal Armoured Corps
The Royal Armoured Corps is the armoured arm of the British Army, that together with the Household Cavalry provides its armour capability, with vehicles such as the Challenger 2 and the Warrior tracked armoured vehicle. It includes most of the Ar ...
was already separate from the other fighting arms of the British Army
The British Army is the principal Army, land warfare force of the United Kingdom. the British Army comprises 73,847 regular full-time personnel, 4,127 Brigade of Gurkhas, Gurkhas, 25,742 Army Reserve (United Kingdom), volunteer reserve perso ...
and the round was not changed for British production. Since the Besa used the same ammunition as Germany used in its rifles and machine guns, the British could use stocks of captured enemy ammunition, albeit without the ability to use their ammunition belts as packaged.
The .303 version of the ZB-53 was presented to the British officials in early 1937 and passed field trials in November 1937 with flying colours (0.5% of stoppages), however in September 1937 the Small Arms Committee had already decided it wanted the 7.92 mm version for which BSA was already tooling up because of the urgency.
The Mark II version, license-produced by BSA in Birmingham as opposed to ZB's Mk I, entered service in June 1940. The design was modified to be more rapidly and economically produced and three simplified models, the Mark II*, Mark III and Mark III*, entered service in August 1943. The Mark II* was a transitional model designed to use the new simplified parts but was compatible with the Mark II. All those versions had a selector to give a high rate of fire (750–850 rounds per minute) for close combat or focused targets or a low rate of fire (450–550 rounds per minute) for long-range combat or area targets. The Mark III and Mark III* versions did away with this selector and had simplified parts like the Mark II* but were incompatible with the Mark II. The Mark III had a fixed high rate of fire (750–850 rpm) and the Mark III* had a fixed low rate of fire (450–550 rpm) Damaged or malfunctioning Mark IIIs were converted to Mk III* at factories during repair.
The earlier wartime Mark I, Mark II and Mark II* versions of the Besa 7.92 mm were declared obsolete in 1951 and all Mark III versions were converted to Mark III*. The Mark III/2 introduced in 1952 was a conversion of the Mark III* with a new bracket and body cover. The later Mark III/3 introduced in 1954 was a conversion of the Mark III/2 that replaced the barrel and sleeve and made the gas vents larger on the gas cylinder to make it easier to use belts of mixed ammunition. The post-war Mark III/2 and Mark III/3 remained in service until the late 1960s.
15 mm Besa machine gun
A larger, heavier 15 mm version (also belt-fed) was developed by BSA from the Czechoslovak ZB-60 heavy machine gun as vehicle armament. It could be fired in semi-automatic mode as well as fully automatic. It was introduced in British service in June 1940 and was used on the Light Tank Mk VIC and on armoured cars such as the Humber Armoured Car Marks I–III. Over 3,200 15 mm Besa were manufactured until it was declared obsolete in 1949. It fired a bullet from a cartridge with a muzzle velocity of at a rate of 450 rounds per minute. The 15 mm Besa was fed from 25-round metal belts, which limited its practical rate of fire, although the weapon was usually used for single shots as it was difficult to fire accurately in automatic.David Fletcher (1989). ''Universal Tank: British Armour in the Second World War – Part 2''. HMSO. . p.20See also
* Bren gun – another ZB design taken up by the UKReferences
;Notes ;Citations ;BibliographyThe ZB-53, heavy machine gun model 37
– in Czech
Accessed 29 November 2007 * David Boy
Other British Tank Armaments
wwiiequipment.com 1 January 2009 *
External links
* https://web.archive.org/web/20120322211957/http://www.churchilltank.com/Home_Page/THE_BESA_MACHINE_GUN.html * http://en.valka.cz/viewtopic.php/t/32150 * https://web.archive.org/web/20160304051457/http://www.municion.org/15/15x104Besa.htm {{BritishEmpireWeapons 7.92×57mm Mauser machine guns Machine guns of the United Kingdom Machine guns of Czechoslovakia Medium machine guns Tank guns World War II machine guns World War II weapons of the United Kingdom Czechoslovakia–United Kingdom relations Heavy machine guns