12-inch/50-caliber Mark 7 gun

12"/50 caliber Mark 5 Naval Gun
12"/50 caliber Mark 5 Naval Gun
	USS Arkansas (BB-33) firing her 12"/50 guns in battle practice prior to World War I
Type	Naval gun
Place of origin	United States
Service history
In service	1912-1952
Used by	United States Navy; Argentine Navy;
Wars	World War I; World War II;
Production history
Designer	Bureau of Ordnance
Designed	1910
Manufacturer	U.S. Naval Gun Factory; Bethlehem Steel;
No. built	Mod 0: 28 (Nos. 180–182, 186–210); Mod 2: 3 (Nos. 183–185); Mod 3: 6 (Nos. 211–216); Export: 17 (Nos. 795–817, 919–920);
Variants	Mods 0–19
Specifications
Mass	121,489 lb (55,106 kg) (without breech); 123,160 lb (55,860 kg) (with breech);
Length	50 ft 7.25 in (15.42 m)
Barrel length	49 ft 6.25 in (15.09 m) bore (49.5 calibers)
Shell	870 lb (390 kg)armor-piercing
Caliber	12 in (305 mm)
Elevation	-5° to +15°
Traverse	−150° to +150°
Rate of fire	2–3 rounds per minute
Muzzle velocity	2,900 ft/s (880 m/s) (full charge); 2,100 ft/s (640 m/s) (reduced charge);
Effective firing range	23,900 yd (21,900 m) at 15° elevation

The 12"/50 caliber Mark 7 gun (spoken "twelve-inch-fifty-caliber") was a United States Navy's naval gun that first entered service in 1912. Initially designed for use with the Wyoming class of dreadnought battleships, the Mark 7 also armed the Argentine Navy's Rivadavia-class battleships.

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