Besa machine gun

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 [note 1]).

Besa machine gun
Besa machine gun
TypeTank-mounted medium machine gun
Place of originCzechoslovakia, United Kingdom
Service history
Used byUnited Kingdom, Ireland, Israel
WarsSecond World War
1947–1949 Palestine war[1]
Korean War[2]
Second Arab–Israeli War[3]
Production history
DesignerVáclav Holek
Designed1936
ManufacturerThe Birmingham Small Arms Company Limited
No. built7.92mm: 39,332 in all variants. 15mm: 3,218 total production.
VariantsMark I (1939–1940)
Mark II (1940–1943)
Mark II*(1943)
Mark III (1943–1951)
Mark III* (1943–1952)
Mark III/2 (1952–1966)
Mark III/3 (1954–1966)
15mm Besa Mark I (1939?–1949)
Specifications
Mass47 lb (21 kg) empty
Length43.5 in (1,100 mm)
Barrel length29 in (740 mm), 4-groove rifling with Right Hand twist.
Cartridge7.92×57mm Mauser
Calibre7.9mm
Actiongas automatic
Rate of fire450–550 round/min (Low)
750–850 rounds/min (High)
Muzzle velocity2,700 ft/s (823 m/s)
Feed system7.92mm: 225 metal link belt. 15mm: 25-round link belt.

The name came from the Birmingham Small Arms Company (BSA), who signed an agreement with Československá zbrojovka to manufacture the gun in the UK. The War Office 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 as a mounted machine gun for tanks and other armoured vehicles as a replacement for the heavier, water-cooled Vickers machine gun. Although it required a rather large opening in the tank's armour, it was reliable.

Development and use
Vickers Light Tank AA MkI with 4 Besa machine guns

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 considered 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 was already separate from the other fighting arms of the British Army 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. While American-produced armoured cars or tanks would have been fitted with .30 cal Browning machine guns, many British tanks and armoured cars were equipped with the Besa machine gun fed from non-disintegrating disposable 225-round steel metal-link belts.

German 7.92×57mm Mauser ball ammunition dating from 1941. This ammunition could be used in the Besa if necessary

The Mark II version entered service in June 1940, modified with 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 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. The Mark III and Mark III* versions did away with the rate 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)[4]

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.

7.92x57mm Besa ammunition
DesignationIn ServiceMarkings
Cartridge S.A. Ball 7.92 m/m Mark Iz May 1939 – November 1941 Purple annulus, Iz on headstamp.
Cartridge S.A. Ball 7.92 m/m Mark IIz September 1941 – 1966 Purple annulus, IIz on headstamp
Cartridge S.A. Tracer 7.92 m/m G Mark Iz October 1939 – November 1941 Red annulus, GIZ on headstamp
Cartridge S.A. Tracer 7.92 m/m G Mark IIz September 1941 – 1945 Red annulus, GIIZ on headstamp
Cartridge S.A. Tracer 7.92 m/m G Mark 3z April 1945 – 1966 Red annulus, G3Z on headstamp
Cartridge S.A. Armour-Piercing 7.92 m/m W Mark Iz March 1941 – November 1941 Green annulus, WIZ on headstamp
Cartridge S.A. Armour-Piercing 7.92 m/m W Mark IIz September 1941 – 1966 Green annulus, WIIZ on Headstamp
Cartridge S.A. Incendiary 7.92 m/m B Mark Iz 1942–1966 Blue annulus, BIZ on headstamp

15 mm Besa machine gun
Humber Armoured Car Mk 2 with 15mm Besa HMG

A larger, heavier – at 57 kg (125 lb) – 15 mm version (also belt-fed) was developed by BSA from the Czechoslovak ZB vz.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.[5] It fired a 75 gramme bullet from a 15×104 mm cartridge with a muzzle velocity of 818.3 m/s (2,685 ft/s) at a rate of 450 rounds per minute.[6] 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.[7]

See also
  • Bren gun – another ZB design taken up by the UK

References
Notes
  1. "TK" from těžký kulomet "heavy machine gun"; "vz" from vzor "Model"
Citations
  1. Laffin, John (29 July 1982). The Israeli Army in the Middle East Wars 1948–73. Men-at-Arms 127. Osprey Publishing. p. 8. ISBN 9780850454505.
  2. Tucker, Spencer C.; Pierpaoli, Paul G., Jr., eds. (2010). "Machine guns". The Encyclopedia of the Korean War: A Political, Social, and Military History. 1. A-L (2nd ed.). ABC-CLIO. p. 535. ISBN 978-1-85109-849-1.
  3. Katz, Sam (23 June 1988). Israeli Elite Units since 1948. Elite 18. Osprey Publishing. p. 13. ISBN 9780850458374.
  4. http://www.militaryfactory.com/smallarms/detail.asp?smallarms_id=221 accessed 27 December 2007
  5. Jane's Infantry Weapons. 1975. p. 453.
  6. "British Tanks Equipment". Archived from the original on 16 September 2011. Retrieved 25 December 2014.
  7. David Fletcher (1989). Universal Tank: British Armour in the Second World War – Part 2. HMSO. ISBN 0-11-290534-X. p.20
Bibliography
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