The Multi-Laser is a rapid-fire heavy laser weapon, ideal for destroying lightly-armoured vehicles or infantry formations. Due to its power requirements and weight, it is usually mounted on Imperial vehicles such as Chimeras or Sentinels, or platform-mounted and operated by a Techmarine where it is known as a Rapier Multi-Laser. While the standard Lascannon is a semi-automatic weapon (one squeeze of the trigger fires one shot), the Multi-Laser is fully automatic; it fires laser beam after laser beam as long as the trigger is held down. The Multi-Laser can be considered to be a bigger variant of the Hellgun. The Eldar have a similar weapon called a Scatter Laser which has a better rate of fire and a similarly more Eldar-like design.

Sources

• Codex: Imperial Guard (5th Edition)