Russell,
* The barrel measurement is from the front of the breech face w/out the firing pin extended to the crown of the barrel. A pencil inserted eraser end first into an uncocked, unloaded P.08's barrel, scribed/marked @ the crown, retracted & measured is a good method of assessing the barrel's length. Of course, its going to take a "loooong pencil" to do an Arty. Your 7 & 7/8ths" = 7.875" is awfully close.
* P.08 = 100mm = 3.937". Called a 4" Bbl.
* LP.06 Navy = 150mm = 5.906". Called a 6" Bbl.
* LP.08 Arty = 200mm = 7.874". Called an 8" Bbl.
* The toggle pin was not S/numbered in the Imperial era. Wasn't till '33 that this pin began to be numbered. The F/Pin retainer was not S/numbered.
* Trust this helps.
Respectfully,
Bob
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