Soldier Force Bradley and gatling cannons
Space Quest vehicle for the mount
Craft store lollypop sticks for the gun barrels
Pieces of craft store wood for the ammo cans
Various bits from my parts box

The Hydra is an advanced self-propelled anti-aircraft gun vehicle (Zenitnaya Samokhodnaya Ustanovka) used by Soviet ground forces. The October Guard has tasked a few of these to bolster their arsenal. The Hydra uses an advanced Radar targeting system to track and destroy enemy aircraft. The weapons are also suited for destroying lightly armored ground vehicles. The cannons are capable of firing at rate of 4000 rounds-per-minute, though the trained operators usually fire 10 round bursts to prolong barrel life. The Hydra's targeting system allows the vehicle to fire on the move as well as stationary. The vehicles crew consists of one driver, one tank commander/gunner and one loader.