Gas-operated, air-cooled automatic gun developed for both land and naval use. Only two prototypes were completed before the end of World War II. Interesting in that no alloy steels were to be used in its construction, a reflection of the growing shortages in Germany as World War II neared its end.

Used a five-round ammunition clip and the gun fired with the breech locked as it moved forward from recoil.

Gun Characteristics

Designation 5.5 cm/77 (2.165") Gerät 58
Ship Class Used On Planed for the Type 1942C destroyers
Date Of Design 1944
Date In Service N/A (prototypes, only)
Gun Weight 1,430 lbs. (650 kg)
Gun Length oa 236 in. (6.000 m)
Barrel Length 166 in (4.220 m)
Rifling Length 148 in. (3.750 m)
Grooves (20) 0.030 in deep x 0.171 in (0.75 mm x 4.34 mm)
Lands 0.169 in (4.3 mm)
Twist Increasing RH 1 in 90 to 1 in 25.6
Chamber Volume N/A
Rate Of Fire 120 - 150 rounds per minute cyclic
Could also be fired in single-shot mode


Type Fixed
Weight of Complete Round 11.8 lbs. (5.3 kg)
Projectile Types and Weights AA: 4.4 lbs. (2.0 kg)
Bursting Charge about 0.46 lbs. (0.200 kg)
Projectile Length N/A - Complete Round 26.2 in (665 mm)
Propellant Charge 2.4 lbs. (1.1 kg) (Probably RPC/40N)
Cartridge 55 x 450B
Muzzle Velocity 3,350 fps (1,020 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A


Range with 4.4 lbs. (2.0 kg) Shell
Elevation Distance
45 degrees about 4,370 yards (4,000 m) effective
AA Ceiling @ 80 degrees about 6,900 feet (2,500 m) effective
Flight Time with 4.4 lbs. (2.0 kg) Shell
Muzzle Velocity Distance Time
3,350 fps (1,020 mps) 1,090 yards (1,000 m) 1.10 seconds
2,190 yards (2,000 m) 2.50 seconds
3,280 yards (3,000 m) 4.34 seconds
4,370 yards (4,000 m) 6.75 seconds

Mount / Turret Data

Designation Single Mounts
Weight N/A
Elevation about -10 / 90 degrees
Elevation Rate N/A
Train 360 degrees
Train Rate N/A
Gun recoil N/A

Various types of mountings were under investigation, including triaxial and quadaxial designs as well as an Army biaxial mounting.


Data from:

  • "Naval Weapons of World War Two" by John Campbell
  • "German Warships 1815-1945" by Erich Gröner
  • "Rapid Fire" by Anthony G. Williams

Page History

05 August 2006
20 May 2012
Added Cartridge Data