Calibre: 3.7 cm Length: 3.300 m Weight: 1,248 kg Breech: gas operated bolt, percussion fired Recoil: Carriage: cruciform Elevation: -7° 30 to +90° Traverse: 360� Rate of fire: 250 rounds per minute Muzzle velocity: 820 m/s Effective range: 6,585 m Shell Weight: 635 gm Used by: Heer Variants: 3.7 cm Flak 18 3.7 cm Flak 36/37 3.7 cm Flak 43 3.7 cm Flakzwilling 43 3.7 cm BK