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Look here the british version had a shorter case for some reason.
Gun Characteristics
Designation USA: 20mm/70 (0.79") Marks 2, 3 & 4
British: 20mm/65 (0.79") Mark II
Ship Class Used On Almost all
Date Of Design about 1939
Date In Service 1942
Gun Weight 150 lbs. (68.04 kg) (including breech mechanism)
46 lbs. (20.865 kg) (without breech)
Gun Length oa 87 in (2.210 m)
Bore Length 55.1 in (1.400 m)
Number Of Grooves 9
Length Of Rifling N/A
Chamber Volume N/A
Rate Of Fire 450 rounds/minute per barrel
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