Underwater firearm developed by the United States during the Cold War
M1 Underwater Defense Gun
Type
Underwater pistol
Place of origin
United States
Service history
In service
1970–1976
Wars
Falklands War[citation needed]
Production history
Designed
1967
Specifications
Mass
Empty: 2.26 lb (1.03 kg) Loaded: 4.17 lb (1.89 kg)
Length
9.75 in (248 mm)
Barrel length
4.25 in (108 mm)
Cartridge
Mark 59 Mod 0 Projectile
Barrels
6
Action
Double action only Pepper-box
Rate of fire
12 rpm
Muzzle velocity
740 ft/s (230 m/s)
Effective firing range
30 ft (9.1 m)
Feed system
6-round removable cylinder
The M1 Underwater Defense Gun, also called the Underwater Defense Gun Mark 1 Mod 0, is an underwater firearm developed by the United States during the Cold War. Similar to other underwater firearms, it fires a special 4.25-inch (108 mm) metal dart as its projectile.
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