Mk X-B: A late-war variant designed for vehicles and fitting the "Little John" device. From 1935, the Ordnance QF 2-pounder was the staple Anti-Tank weapon used by the British Army, throughout the Empire. It only started to be replaced in 1942 as the 6-Pounder became available.
It began as a specially designed gun for a tank, the Cruiser Mk.I, and as such, had to be compact, light, and fast to reload. At a time of budgetary cuts, the Director of Artillery chose it in 1934 also as the main AT gun for the infantry, mainly for standardization purposes. The three-legged mount construction was attributed to Woolwich Arsenal. General Conception : Vickers won the contract for Ordnance QF 2-pounder Mark IX on Carriage Mark I, and a few prototypes were assembled and tested in 1936-37. The carriage was innovative, with a combination of small road wheels and legs, one of which, at the rear was also used as a towing tail, and the two on the front, shorter, were folded up for transport. When deployed, the wheels were lifted up and the three legs platform formed a strong support on all types of grounds, also allowing the mount a 360 degree traverse. A second Mk.II carriage, simplified for mass production, included fully removable road wheels. Both the caliber and rate of fire of the 2-Pdr (a 40mm caliber) outperformed the German Pak 36 and similar 37mm guns in foreign armies.
However, it was bigger, taller, heavier and thus easier to hit and slower to deploy. Also no HE round was never provisioned for it, despite such round was studied in 1940 but never materialized int production. The Ordnance 2 Pounder found itself the only AT gun of the British army from 1939 to 1942 at least, when the 6-Pdr was introduced on the frontline. It saw action for most of the war in many theaters of operations with the Commonwealth armies, in France, Italy, Norway, North Africa, Eastern Africa, India, the Eastern Indies, and New guinea, not only as a standard infantry AT gun, but mounted on a variety of vehicles. However in North Africa against up-armoured Panzer III and IV it proved useless but only at short range on vulnerable spots, and the situation would come to worsen over time. However, it was found adequate on the southern Pacific and eastern Indies against weekly protected Japanese tanks. Whoolwich’s only began to replace it by the spring of 1942. Both the range and efficiency of the ammunition used were improved in the meantime. One improvement made to the gun was the adoption of the Little John Adapter on 2-Pounder Tank Guns. This adapter worked on the Squeeze Bore principal and fired a special APCNR (Armor-Piercing Composite Non-Rigid) high-velocity shell. It almost doubled the armor piercing capability of the weapon and would see service until the end of the war on vehicles such as the Daimler Armored Car. Bren Carrier, in the form of the Australian’s LP2 Cruiser Tanks Mark I to VI Crusader Candian Crusier Tank Ram Australian Cruiser AC I Sentinel Infantry Tank Mk. IV Churchill I Light Tank Mark VII Tetrarch Light Tank Mark VIII Harry Hopkins Daimler Armored Car. It has long been thought that the 2-Pounder gun was never equipped with High-Explosive (HE) shells, this is not the case however. HE was available to the 2-Pounder gun, but British military thinking was that firing Explosive Shells was the job of the Artillery. As such, towed 2-Pounder crews deployed by the Royal Artillery were equipped with HE ammunition, but Tanks, designed for infantry support such as the Matilda II, were not equipped with them. The 2-pounder actually had two types of exploding shell produced for it, namely the 1934 – 1937 pattern APHE shell and the HE fragmentation shell. The shell weighed 1.87 Pounds and used the Hotchkiss base fuse Mark IV. The shell is a blunt-nosed serrated cylinder made of cast iron designed to strike the ground and pitch back into the air then explode, scattering fragments into enemy infantry and animals such as horses. This shell was used by tanks of the BEF in France 1940 but although available in North Africa, was out of favor with crews preferring to stock their ammo racks with AP ammunition. However, anti-tank units always carried a supply for deterring infantry assaults against them.
The 1934 -1937 pattern APHE shell was produced before trials of the 2 Pounder gun took place but failed to meet the War Department’s specifications of being able to have a 70% (7 in 10) probability of penetrating 14mm. of vertical face hardened rolled homogeneous armor plate (Vickers “Vibrax” at a range of 500 yards. base mounted fuse either fell out in the barrel during firing or fell out when the shell hit the test target despite the actual unexploded shell actually penetrating. In other instances, when the fuse stated in the shell would explode with no or partial penetration. Because of this, the British Army elected to dispense with APHE ammunition from 1937 to the present day. at 100 yards versus vertical FHRHA as live APHE and 59mm. at 100 yards versus vertical FHRHA fired inert/unfilled. 562,000 were produced between 1934 and 1937, none were fired in combat or even issued. Instead, stocks were used up on firing ranges in the UK for training and issued to home defense anti-tank units during 1940 after Dunkirk. Reid, a former employee of The Tank Museum, Bovington.
The standard 1939 2-pounder was the main infantry antitank weapon in service with the BEF in may-june 1940.