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For example, the designation 4-in QF Mark XVI* meant a cartridge gun firing a 4 inch (10.2 cm) projectile, with the design being the sixteenth gun in the 4-inch QF series and having had one minor modification to the original design.Official documents generally follow the nomenclature sequence described above.However, gun breeches were usually engraved in slightly different fashion, with the BL or QF designation being first and then the bore size and mark number following along with a Wire or Steel designation denoting the construction method (see Wire-Wound and Built-up below).In addition, official documents for gun calibers that never had QF versions almost invariably omit the BL designation.For clarity, I show all such designations as 4.5" (11.4 cm).
Weapons designed post-war were designated with an N (apparently for "Navy") such as the 6-in QF N5 guns used on the Tiger class cruisers in Mark 26 twin mountings.
Also at this same time, Roman numerals were dropped in favor of Arabic numerals.
Some confusion was created under this new designation system as many older weapons were redesignated per the new system, even though the weapons and mountings themselves did not change.
However, by the early part of the twentieth century, the BL designation was given only to bag guns while the QF designation was used only for cartridge guns.
This separation into BL and QF categories was carried into the designation system, with BL and QF guns of the same caliber being enumerated into different numeric series.