Between battles his responsibility is to clean and maintain the tank's weapons. The gunner is tasked with firing the tank's primary weapon, along with any co-axial weapons, and also functions as the tank's second-in-command. When stationary the driver can man the hull-mounted weapon, though this practice is discouraged by most since it leaves the tank immobile.

The driver is next in seniority, a highly technical job responsible for not only driving the tank but also overseeing basic maintenance of the tank's running gear. Outside of combat his job will be to keep track of the tank's logistical needs and ensure it has been re-armed and refueled prior to battle. Above them is the loader, responsible for loading the main gun and, as needed, manning the hull-mounted weapon. The sponson gunners are the most junior members of the crew, responsible for manning the cramped sponson weapons and otherwise aiding the other members in any tasks. Ī minimum of four crew are required to operate the Leman Russ, with two more needed to man the sponson weapons if mounted, though they must do so without comfort in a cramped, hot and noisy environment. These are manned by dedicated gunners and capable of a 90° field of fire to the front and sides of the vehicle. The side sponson mounts are an optional part of the tank's design, but when mounted they can be fitted with a variety of heavy weapons for close-in defense including Heavy Bolters, Heavy Flamers, Multi-meltas or Plasma Cannons. Secondary armament will generally consist of a Lascannon in the forward hull mount with a 90° field of fire though other options include a Heavy Bolter or Heavy Flamer. Auspex guidance such as landscape readers and crosswind indicators provide additional information to assist in locating and targeting the enemy. Aiming the weapon is done through a dedicated periscope with a 45° field of vision with assistance from Targeter gear such as laser-rangefinders. A water-cooled jacket surrounds the cannon while gyrostabilisers ensure accurate targeting while on the move.

The main gun of the Leman Russ is its turret-mounted Battle Cannon, a 120mm smoothbore gun which can equally decimate enemy infantry and tanks.

Leman russ battle tank conversion