The Vickers 40 mm Class S gun was developed in the late 1930s as defensive weapon for bomber aircraft. The ammunition was based on the 40x158R cartridge case of the 40 mm naval QF 2-pounder anti-aircraft gun (known as the "pom-pom").

The QF 2-pounder Mark II was a larger version of the QF 1-pounder Maxim gun produced by Vickers. It was a 40 mm calibre gun with a water-cooled barrel and a Vickers-Maxim mechanism. It was ordered in 1915 by the Royal Navy as an anti-aircraft weapon for …

40 mm "BI" Type 91. This weapon was a Vickers design based on the British 2-pdr. Mark II and used on single and twin mountings similar to those used for the British mountings. About 500 guns and 200 mountings were imported from Britain from 1925 to 1935. Used a 50 round belt although an unsuccessful attempt was made to increase this to 100 rounds.

Anti-aircraft guns are weapons designed to attack aircraft. Such weapons commonly have a high rate of fire and are able to fire shells designed to damage aircraft. They also are capable of firing at high angles, but are also usually able to hit ground targets as well in a direct fire role.

This weapon was a Vickers design based on the British 2 pounder Mark VIII but used on single and twin mountings, with a 50 round belt. Also known as 40mm / 62 caliber "HI" Type 91 Shiki. Replaced by the 25mm Anti-Aircraft Gun Type 96 (1936) .

6 days ago · The Vickers 40mm S-type cannon, which uses armor-piercing shells, can cause damage to most German armored targets except for the Tiger tank. The high-explosive grenade has a lighter body and a higher initial velocity.

This weapon was a Vickers design based on the British 2-pdr. Mark VIII but used on single and twin mountings similar to those used for the British 2-pdr. Mark II mountings.

The Vickers Class "S" was a 40 mm (1.57 in) cannon used to arm British aircraft for attacking ground targets in the Second World War.

Introduced to the Royal Navy in March of 1915 as a large-caliber AA MG. Generally similar to the later 2-pdr Mark VIII including using the same water-cooled barrel, but the automatic mechanism was lighter and less robust. As introduced, these guns used 25-round fabric belts. Used only in single mountings.

Widely used on variety of ships starting in the early 1930s, until replaced by the more effective Bofors 40 mm gun in the mid-1930s on new construction and existing ships (for example the cruiser Java in 1937-1938).