Do you have a
picture of this weapon?


Gas-operated, air-cooled machine-gun used on most Italian warships of World War II. Also used on many submarines in a disappearing twin mount. Manufactured by Breda.

Gun Characteristics

Designation 13.2 mm/75.7 (0.52") Model 1931
Ship Class Used On Many
Date Of Design 1931
Date In Service 1935
Gun Weight 104.5 lbs. (47.5 kg)
Gun Length oa N/A
Bore Length 39.4 in (1.000 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 500 rounds per minute cyclic


Type Fixed
Weight of Complete Round 0.28 lbs. (0.125 kg)
Projectile Types and Weights Ball: 1.8 oz (0.051 kg)
Bursting Charge N/A
Projectile Length N/A: Complete round 5.4 in (13.7 cm)
Propellant Charge 0.54 oz (154 gm)
Muzzle Velocity 2,592 fps (790 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun 1,500 rounds


Range with 1.8 oz (0.051 kg) Bullet
Elevation Distance
45 degrees Maximum: 6,600 yards (6,000 m)
Effective: 2,200 yards (2,000 m)

Mount/Turret Data

Designation Single and twin mountings
Weight Single: N/A
Twin: 1,532 lbs. (695 kg)
Elevation Single: -10 / +90 degrees
Twin: -11 / +85 degrees
Elevation Rate Manually operated, only
Train 360 degrees
Train Rate Manually operated, only
Gun recoil N/A


Data from:

  • "The Italian Navigatori Class, 1926" article by Elio Andò in "Warship Special 2: Super Destroyers" edited by Antony Preston
  • "Naval Weapons of World War Two" by John Campbell
  • "Italian Warships of World War II" by Aldo Fraccaroli

Page History

09 May 2006
26 May 2012
Updated to latest template