12-inch/45-caliber Mark 5 gun

12″/45 caliber Mark 5 Naval Gun
12″/45 caliber Mark 5 Naval Gun
	Mark 5 gun being hoisted aboard USS Connecticut
Type	Naval gun; Coastal defence
Place of origin	United States
Service history
In service	1906–1930
Used by	United States Navy; Greek Navy;
Wars	World War I; Russian Civil War; Greco-Turkish War; World War II;
Production history
Designer	Bureau of Ordnance
Designed	1903
Manufacturer	U.S. Naval Gun Factory
Specifications
Mass	53 short tons (48 t)
Barrel length	45 ft 0 in (13.72 m) bore (45 calibers)
Shell	870 lb (390 kg)
Caliber	12 in (305 mm)
Elevation	-5° to +15°
Rate of fire	2–3 rpm
Muzzle velocity	2,700 ft/s (820 m/s)
Effective firing range	20,000 yd (18,288 m) at 15° elevation; 30,000 yd (27,432 m) at 47° elevation As coastal artillery

The 12″/45 caliber Mark 5 gun was an American naval gun that first entered service in 1906. Initially designed for use with the Connecticut-class of pre-dreadnought battleships, the Mark 5 continued in service aboard the first generation of American dreadnoughts.

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