| UB machine gun | |
|---|---|
 UBS machine gun on display at the Steven F. Udvar-Hazy Center | |
| Type | Machine gun |
| Place of origin | Soviet Union |
| Service history | |
| Used by | Soviet Union |
| Wars | World War II |
| Production history | |
| Designer | Mikhail Yevgenyevich Berezin |
| Designed | 1937–39 |
| Specifications | |
| Mass | 21.45 kilograms (47.3 lb) (UBS) 21.14 kilograms (46.6 lb) (UBK) 21.43 kilograms (47.2 lb) (UBT) |
| Length | 1,347 mm (53.0 in) (UBS, UBK) 1,397 mm (55.0 in) (UBT) |
| Barrel length | 890 mm (35.0 in) |
| Cartridge | 12.7×108mm |
| Action | Gas |
| Rate of fire | 800–1050 RPM (700-800 synchronized UBS) |
| Muzzle velocity | 814 m/s (2,670 ft/s) |
| Feed system | Belt-fed |
| Sights | Iron sights |
The Berezin UB (Russian: УБ - Универсальный Березина) (Berezin's Universal) was a 12.7 mm caliber Soviet aircraft machine gun widely used during World War II.