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|caliber=128 mm (5.03 in) <!-- Artillery specifications -->

|name=Bofors 57 mm |caption=Bofors 57 mm Mk 1, as mounted on the Swedish Spica-II Class FAC.

The '''[[Hispano-Suiza]] HS.820''' was a 20 mm [[autocannon]] developed primarily for aircraft use, but more widely used i ....uk/an_introduction_to_collecting_20.htm "An introduction to collecting 20 mm cannon cartridges"], Anthony Williams</ref> The HS.820's high 1100 m/s [[mu

|cartridge= 20 x 80 mm |caliber= 20 mm

|name= 35 mm Oerlikon GDF-003 |image= [[File:35 mm Oerlikon.jpg|300px]]

...ter aircraft]]'s wing. The FF series served as the inspiration for many 20 mm cannon that would be used in [[World War II]] , including the French [[Hisp ...mm round which gave 750 m/s, and the 39 kg '''FF S''' firing a 20 mm x 110 mm round at 830 m/s at a slightly slower 470 rounds per minute. The original g

|type=[[Naval gun]]<br>[[Field gun|Medium field gun]]<br>[[Coastal artillery|Coastal defence gun]] |caliber={{convert|120|mm|sigfig=3}}

|name= QF 6 inch 40 calibre naval gun<br>''Type 41 6-inch (152 mm)/40-caliber'' |caliber={{convert|6|in|mm|sigfig=4}}

...(arms)|advanced primer ignition blowback]] mechanism pioneered by the [[20 mm Becker|Becker]] cannon, but fired different ammunition: 20x72RB, 20x100RB a ...igō Kizyū, Kanji: 九九式二号機銃) The Japanese Navy classified 20-mm weapons as machine guns rather than cannon.<ref name="Mikesh"/> These weapo