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When using "hand in" to convert to hands and inches, the rounded hands and inches values are equivalent, and use the same fraction, if any. Special rounding of the inches value only occurs when "hand in" is the output.
United States naval gun terminology indicates the gun fires a projectile 5 inches (127.0 mm) in diameter, and the barrel is 54 calibers long (barrel length is 5" × 54 = 270" or 6.9 meters.) [1] In the 1950s a gun with more range and a faster rate of fire than the 5"/38 caliber gun used in World War II was needed, therefore, the gun was created ...
The 5-inch (127 mm)/54-caliber (Mk 45) lightweight gun is a U.S. naval artillery gun mount consisting of a 5 in (127 mm) L54 Mark 19 gun on the Mark 45 mount. [1] It was designed and built by United Defense , a company later acquired by BAE Systems Land & Armaments , which continued manufacture.
The UK replacement for 5.5 inch was the FH-70 155 mm towed howitzer, in service as the L121. The last 5.5 rounds were fired in the UK in 1995. The last 5.5 rounds were fired in the UK in 1995. In use, the 5.5 was generally towed by the AEC Matador artillery tractor .
A small number of these guns were converted to QF to use the same cartridges as the QF 4-inch gun. They were designated Mk I/IV, I/VI etc. depending on which Mark of BL 4-inch had been converted. All had a bore of 27.85 calibres after conversion, with a muzzle velocity of 2,177 ft/second. [2]
The 4.5-inch howitzer entered Irish service in 1925 to equip the newly formed 3rd Field Battery. Additional equipment received by the Irish Army in 1941 included four 4.5-inch howitzers. In 1943–44, 20 additional 4.5-inch howitzers were received. Thirty-eight 4.5-inch howitzers, all on carriage Mk1PA, were used by the reserve FCA.
From 1895 many ships' guns were converted to QF to use the same brass cartridge case and charge as the modern QF 6-inch guns. They were designated QFC for "QF Converted", and the new Mark designation began at I over the old gun Mark e.g. I/IV was the first version of Mk IV gun converted to QFC, II/VI was the second version of Mk VI gun converted.
In 1941, 100 of the obsolete guns were converted to become the 3-inch 16 cwt anti-tank gun, firing a 12.5-pound (5.7 kg) armour-piercing shell. [30] They appear to have been mainly deployed in home defence.