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During World War II the PL Locks and AC Slide Boxes (a component separate to the gun attached to the bottom and face of the breech block using a rifle-calibre tube insert to initiate firing of the bagged charge) utilising 0.5 inch (12.7 mm) tubes were replaced by PK Locks and Y Slide Boxes using 0.303 inch (7.7 mm) tubes.
The 5.5 inch guns were removed from HMS Hood in the 1935 refit. In 1940 two were installed in Fort Bedford Battery on Ascension Island and remain there today. A pair were installed in specially built casemates on the roof of Coalhouse Fort in Essex, overlooking the Thames. [4]
The 5.25-inch gun was carried in Mk I twin mountings by the King George V class and in Mk II twin mountings on nine of the first eleven Dido-class anti-aircraft cruisers, the exceptions being HMS Scylla and HMS Charybdis, which mounted QF 4.5-inch Mk III guns due to shortages of the 5.25-inch gun.
From the BL Mark I gun of 1916 the 4.7-inch (120 mm) calibre was the mid-calibre weapon of the Royal Navy, used particularly on destroyers.Apart from some ships armed with QF 4-inch Mk V guns due to shortages, it remained the standard weapon for destroyers up to the W-class destroyers of 1943.
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The BL 4.5 inch medium gun was a British gun used by field artillery in the Second World War for counter-battery fire. Developed as a replacement for the BL 60-pounder gun it used the same carriage as the BL 5.5-inch medium gun but fired a lighter round further.
The BL 7.5-inch Mk II–Mk V guns [note 1] were a variety of 50-calibre naval guns used by Britain in World War I. They all had similar performance and fired the same shells. They all had similar performance and fired the same shells.
Shell: HE: Shell weight: 202 pounds (92 kg) Calibre: 7.2 inches (182.9 mm) Breech: Welin screw & asbury mech: Carriage: Box trail: Elevation: 0° to 45° Traverse: 4° left & right: Rate of fire