This is a cannon originally conceived after World War I as an antitank gun. It is now mainly found in the Twilight 2000 world on the M-8 Greyhound armored car in Third World nations.

This large caliber gun was designed as an antitank gun during the Second World War, and was the first to use discarding sabot ammunition. It was also known to the US and US allies as the 57mm M-1, and copied by the Russians.

This is a large-caliber gun mounted on the BMP-1, BMD-1, BVP-1, Type 85, and WZ-551 infantry fighting vehicles. It ammunition is a modified version of the ammunition for the SPG-9 recoilless rifle.

This is an older French gun derived from World War 2 tanks such as the Sherman, Grant, and Lee. It is mounted on some older French vehicles such as early version of the AMX-13.

This weapon was designed as an antitank weapon during the Second World War. It is still found on some field pieces and some old Sherman tanks and other vehicles still in use by Third World countries.

This is a Russian gun found on older tanks like the T-34 and light tanks like the PT-76. It is outmoded and outgunned by newer weapons, but is still used on these vehicles and on field pieces.

This large-caliber gun is found on vehicles such as the Scorpion, Rooikat, and other light vehicles. It is useful against light armor, but cannot stand up against heavier vehicles, and is primarily useful as a support weapon.

This is a large-caliber gun used on field guns and vehicles such as the Type 63 and T-34/85. It is an improvement over the D56TM, but still no match for more modern weapons.

A large-caliber gun found on several French-made armored vehicles and some vehicles of other countries, such as Switzerland and Austria. The ammunition range is not as wide as that for the NATO 90mm gun.

This gun is fitted to a wide variety of NATO vehicles and vehicles of many other countries worldwide. It has reasonable effectiveness except against tanks and can use a wide variety of ammunition types.

This is an older Russian large caliber gun found on such tanks as the T-55 and Type 69, as well as field pieces, and a modified form is found on newer vehicles such as the BMP-3 and newer Pact T-55s. (This newer version can fire AT-10 ATGM through the gun barrel.) This gun has been much modified over the years in attempt to increase its effectiveness, and a wide variety of ammunition is available for it. Unlike most large-caliber tank guns, the D-10 may be used as an artillery piece, and has an indirect fire range.

This was the standard US and Western tank main gun for almost 30 years before its replacement by the 120mm Rheinmetall. It is installed on a wide variety of tanks and armored vehicles, from the AMX-10RC to the M-1 tank. It has a large amount of different ammunition types available, in an attempt to keep it current. The British L-7 has a different breech, but is otherwise the same weapon.

This is the standard armament on the Russian T-62 tank, and some early models of the T-64. Its fin-stabilized rounds have a flat trajectory and reasonable accuracy. Its two-part rounds take longer to load than comparable NATO rounds.

This German-designed gun is standard on most new US, NATO, and Western-aligned nations' tanks, as well as the Chinese Type 89 antitank gun. Though its performance is superior to most tank guns, new ammunition has been devised over the years to keep up with current threats.

This is a longer barrel-length version of the standard 120mm Rheinmetall gun, found on the M-1A2P31, M-1A2 Giraffe, Leopard 2A5, and some models of the Merkava 3. It has better range than its standard (L/44) counterpart.

This is the British rifled gun counterpart to the 120mm Rheinmetall, in the same manner that the L-7 is the British counterpart to the 105mm NATO gun. The L-11 arms most British-made tanks; however, just before the Twilight War, these guns were being replaced by Rheinmetall guns to take advantage of the wider ammunition choices.

This gun arms most modern Russian tanks, since its introduction on the T-64. Updates have made it able to fire various ATGM through its gun barrel (such as the AT-8 and AT-11). This weapon is also mounted on a field carriage, known as the Rapira-3. The ATGM-firing versions were introduced because the 125mm Russian gun's long-range performance is not good. The autoloader for this gun on Russian tanks tends to grab the gunner's arm and attempt to load it into the gun barrel; on a catastrophic failure, the GM may rule that this has happened (causing 2d6 damage to the gunner's right arm, and requiring 6 phases to clear). This does not happen on the Rapira-3, since it does not have an autoloader.

This is a gun found on the Russian 2S25 light airborne tank. It fires the same round as the 125mm Russian gun, but with a reduced powder charge to compensate for the lighter carriage on the vehicle. This affects range and hitting power.

This Russian cannon is so far found only on the newest Russian tank, the T-95. It is a hard-hitting gun with better performance than the Russian 125mm, and it introduces a new fuel-air explosive round to the Russian arsenal, normally used against light vehicle columns.

This is the next generation of Western tank guns, installed on such vehicles as the Leopard 2-140 and Merkava 4. Ammunition for this weapon was always scarce during the Twilight War, as so few vehicles used it, and little was made. However, its performance was rewarding.

This is a gun fitted to the French AMX-30 EBG combat engineer vehicle, used to destroy fortifications and obstacles. It has a secondary use of blowing mines in place. It fires only one type of round.

This unusual weapon is found only on the Sheridan airborne combat vehicle (though in the 1960s and 1970s it was also found on the M-60A2 tank). It recoil is so violent for such a light tank that the firing of any conventional gun round (but not the Shillelagh missile) that there is a 2 in 10 chance on each firing that the rangefinder takes minor damage. This gun can also fire the Shillelagh ATGM through its gun tube (see US ATGMs).

This is a gun mounted on the US M-728 and British Chieftain AVRE combat engineer vehicles. It is the same concept as the French 142mm Demolition Gun listed above, but in a larger form.