The British Mark 23's BL designation differs from the later QF weapon associated with the Tiger class. The exact relationships among the later gun and mounting marks remain uncertain in the exchange. One Mark 23 manual is reported to use the written phrase "quick firing" alongside BL, so descriptive wording and formal designations can overlap. Counting mark numbers alone is therefore a poor guide to how the weapons developed.
Notable Point · 6:01:49-6:04:13
Why QF and BL labels complicate British 6-inch gun comparisons
Formal BL and QF designations need to be distinguished from descriptive uses of quick firing in manuals.