Ammunition
Ammunition for the original low-angle guns introduced in World War I was Separate QF i.e. the shell and cartridge were separate items, but in World War II most guns used Fixed QF ammunition i.e. a single unit.
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Fixed QF cartridge for LA (low-angle) gun, 1930s -
Crew storing fixed rounds on the Kingfisher class sloop HMS Widgeon, August 1943
Read more about this topic: QF 4 Inch Mk V Naval Gun