The QF 4.7-inch Gun Mks I, II, III, and IV were a family of British quick-firing 4.724-inch (120 mm) naval and coast defence guns of the late 1880s and...

Royal Navy gun, see 4.5 inch Mark 8 naval gun. Like all British nominally 4.5 inch naval guns, the QF Mk I has an actual calibre of 4.45 inches (113 mm)...

The QF 4 inch Mk V gun was a Royal Navy gun of World War I which was adapted on HA (i.e. high-angle) mountings to the heavy anti-aircraft role both at...

The Ordnance QF Hotchkiss 6 pounder gun Mk I and Mk II or QF 6 pounder 8 cwt were a family of long-lived light 57 mm naval guns introduced in 1885 to defend...

The QF 4-inch gun Mk IV was the main gun on most Royal Navy and British Empire destroyers in World War I. It was introduced in 1911 as a faster-loading...

a prewar Vickers naval 3-inch (76 mm) QF gun with modifications specified by the War Office in 1914. These (Mk I) included the introduction of a vertical...

19th century and the start of the 20th century. In British service it was known as the QF 6-inch Mk I, II, III guns. As the 15 cm/40 (6") 41st Year Type...

Ordnance QF 13-pounder Mk IV anti-aircraft gun was an Elswick Ordnance commercial 3 inch 13-pounder gun of which 6 were supplied during World War I. The Ordance...

The QF 4-inch gun Mks I, II, III were early British QF (quick-firing) naval guns originating in 1895. They all had barrels of 40 calibres length. The...

4.7 inch QF Mark IX and Mark XII were 45-calibre, 4.7-inch (120 mm) naval guns which armed the majority of Royal Navy and Commonwealth destroyers in World...

120 mm 45 caliber naval gun version in service with the Imperial Japanese Navy from 1918 QF 4.7 inch Gun Mk I – IV 40-calibre version adopted by the Royal...

superseded the QF six-inch gun of the 1890s, a period during which the Royal Navy had evaluated QF technology (i.e. loading propellant charges in brass cartridge...

The 4.7 inch QF Mark XI was a 50-calibre, 4.7-inch (120 mm) naval gun mounted on Royal Navy (RN) and Allied destroyers during World War II. The QF 4.7-inch...

The Tank, Infantry, Mk IV (A22) Churchill was a British infantry tank used in the Second World War, best known for its heavy armour, large longitudinal...

The Ordnance QF 6-pounder 6 cwt Hotchkiss Mk I and Mk II was a shortened version of the original QF 6 pounder Hotchkiss naval gun, and was developed specifically...

specifically for the Firefly, the MkIV. A new horizontal-sliding breech was designed as the usual vertical-sliding breech of the Mks I and II made loading very...

Table for Ordnance QF, 18-pr Mks I to V 2CRH Shrapnel, 4/7.5 CRH HE, 1929 Range Table for Ordnance QF, 18-pr Mks I to IV 2CRH Shrapnel, 4/7.5 CRH HE, 1929...

variant – the Mk II – differed from the pre-production Mk I in having a shorter L/43 barrel, because of the shortage of suitable lathes. The Mk IV was fitted...

France QF 18-pounder gun - WWI era, replaced by 25 pdr Coast defence guns QF 6-pounder 10 cwt QF 12-pounder QF 4.7-inch Mk I–IV BL 6-inch Mk VII & Mk XXIV...

The QF 4 inch Mk XVI gun was the standard British Commonwealth naval anti-aircraft and dual-purpose gun of World War II. The Mk XVI superseded the earlier...

Mk IV (A13 Mk II) was a British cruiser tank of the Second World War. It followed directly on from the Tank, Cruiser, Mk III (A13 Mk I). The first Mk...

entered service in February 1915. The Mark I–V had many relatively minor differences in the carriages and trails and Mk IV, Mk VI and QF Mk II 6-inch naval...

liner. The Mk III started as a combination of the Mk I breech with the Mk II barrel. A prototype development of the 3.7-inch gun using the QF 4.5-inch naval...

Mk VI, Crusader - MkI and Mk II Infantry Tank Mk II, Matilda Infantry Tank Mk III, Valentine - Marks I to VII Infantry Tank Mk IV, Churchill - Mk I and...

the worn-out Mk I guns on surviving ships. These were the only BL-type 4.7-inch guns in British service, all others have been of the QF-type. They were...

The QF 4-inch Mk XIX gun was a British low-velocity 4-inch 40-calibre naval gun used to arm small warships such as Bathurst and Castle-class corvette...

gunpowder propellants. The 5-inch calibre was soon discontinued in favour of QF 4.7-inch. Guns equipped the following British warships : Mariner-class...

introduced in January 1944. Mark III/I This was a Mk III gun with the same modification to the ring and block as for the Mk II/I. Mark IV barrel The Mark IV was...

The Tank, Cruiser, Mk I (A9) was a British cruiser tank of the interwar period. It was the first cruiser tank: a fast tank designed to bypass the main...

The BL 7.5-inch gun Mk I was a British 45-calibre, medium-velocity, naval gun which entered service with the Royal Navy in 1905. This gun was only mounted...