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The Berezin UB was a heavy machine gun used in fixed and flexible mountings on aircraft of the Soviet Union.


Developed in the early 1940s, the Berezin UB was a gas operated,[N 1] belt fed weapon designed to fire the standard Russian 12.7 x 108 Rimless Cartridge.[2]

The Berezin was one of the three main gun types available to the Soviet Air Force at the time of Operation Barbarossa,[3] and was generally considered to be one of the best weapons in its class, with a better combination of weight and performance than the Browning M2 Machine Gun.[4]

Some examples of the MiG-3 carried UB MGs in pods under the wings, in addition to the single example in the cowling.[4] The UB was also adapted to replace RCMGs in Soviet bombers.[5]


The Berezin weighed 25 kg, measured 135 cm (including the 101 cm barrel), and had a rate of fire ranging from 900 to 1,050 rounds per minute.[6]



  1. The gas operation mechanism was believed to have been inspired by that used in the 20 mm Lahti Cannon, examples of which were captured during the Winter War[2]


  1. Mondo SGM
  2. 2,0 2,1 Vorlage:Rapid Fire Page 69.
  3. Williams, Anthony G. 2000. Page 156.
  4. 4,0 4,1 Williams, Anthony G. 2000. Page 157.
  5. Williams, Anthony G. 2000. Page 160.
  6. Williams, Anthony G. 2000. Page 259.