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The 12"/50 caliber gun Mark 8 was a US naval gun mounted on the Alaska-class cruiser. The gun, like the "large cruiser" that mounted it, was intended to fill the gap between US "heavy cruisers" (6-8") and US battleships (14-16"). The name describes the size of the shells, 12 inches in diameter, and the length of the bore in calibers (50 bore ...
The Mark 12 5"/38-caliber gun was a United States dual-purpose naval gun, but also installed in single-purpose mounts on a handful of ships.The 38-caliber barrel was a mid-length compromise between the previous United States standard 5"/51 low-angle gun and 5"/25 anti-aircraft gun.
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.
The United States Navy Mk 12 MOD 0/1/H Special Purpose Rifle (SPR) is a designated marksman rifle that was in service with United States Special Operations Forces in the designated marksman role until 2017, also designed to be shorter than standard weapons.
4.5 inch Mark 8 naval gun 55-caliber United Kingdom: Cold War - Modern 120 mm (4.7 in) 12 cm/12 short naval gun Japan: World War II 120 mm (4.7 in) Type 3 120 mm 45 caliber naval gun Japan: World War I - World War II 120 mm (4.7 in) 12 cm/45 10th Year Type naval gun Japan: World War II 120 mm (4.7 in) 12 cm 11th Year Type naval gun Japan
The 12-inch (305 mm)/45-caliber Mark 5 naval gun was designed as an incremental improvement upon the preceding American naval gun, the 12-inch/40-caliber gun Mark 4. [1] As such, it was a very similar weapon, having been lengthened by 5 calibers to allow for improved muzzle velocity, range, and penetrating power.
The 12-inch (305 mm)/40 caliber gun was developed after the Spanish–American War to use the new smokeless powder that had recently been adopted by the Navy. The Mark 3, gun Nos. 15–48 and 50–56, was constructed of tube, jacket, and eight hoops.
There have been a number of 12" guns with 50 caliber length: 12-inch/50-caliber Mark 7 gun, 1910 US naval gun; 12-inch/50-caliber Mark 8 gun, 1939 US naval gun; 12-inch/50-caliber gun (Argentina), probably based on the 1910 US naval gun, used only in the Argentinian Rivadavia-class battleships; BL 12-inch Mk XI – XII naval gun, British naval ...