Now mine was made at the end of Mark IV production, the serial number overlapping with Mark V production. This cylinder has thicker walls in order to handle the more potent nitro-cellulose cartridges. The only difference between the Mark IV and V was that the Mark V had the 'heavy' cylinder and a slightly modified frame to accept this. Similar large orders for the Mark IV had been placed with Webley on the outbreak of the Boer War in 1899.and some 36,000 had been delivered and were in service.
On the 19th September 1914 the Army ordered 20,000 of the then current Mark, the Mark V.
