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3 cm MK 303 (Br)
3cm MK 303 Flakzwilling, two 3 cm MK 303 in the twin mount
Type Anti-aircraft cannon
Place of origin Nazi Germany
Service history
In service unknown
Used by Nazi Germany
Wars World War II
Production history
Manufacturer Krieghoff[1]
Produced 1944–1945
Number built 222 (32 in 1944and 190 in 1945)[1]
Variants 3 cm Flakzwilling MK 303 (Br)
Weight 185 kg (408 lbs)[2]
Length 3.145 m (10 ft 3.8 in)
Barrel length 2.2 m (7 ft 3 in) L/73

Shell 30×210mm
Caliber 30 mm (1.18 in)
Elevation -10°to ±85°
Traverse 360°
Rate of fire 400 rpm (cyclic)
Muzzle velocity 1100 m/s (3,609 ft/s) M-Schos
900 m/s (2,953 ft/s) HE
950 m/s (3,117 ft/s) AP/HE[2]
Feed system 15 cartridge clip

The 3 cm MK 303 Flak and twin-mounted 3 cm MK 303 Flakzwilling (M44) were experimental 30 mm anti-aircraft guns developed in Nazi Germany. They fired the powerful 30x210mm round and only 222 were produced.[1] The gun was to be installed on Type XXI submarines as AA defense[3] and its use as AA defense replacing 2 cm Flak and 3.7 cm Flak weapons was also considered. The use of 3 cm M.K. 303 Flakzwilling on Flakpanzer IV "Kugelblitz" was considered, but rejected. The development began in late 1941[1] and production started in late 1944.

Post War Usage

Postwar PLDvK vz. 53
of Czechoslovak army

In the 50s, the MK 303 was produced in Czechoslovakia under the designation M53, with the clip feed replaced by a 10-round box magazine.[1] It was also used as armament of SPAAG M53/59 Praga.


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