The Grenade Launcher or GL is an anti-structure siege weapon employed by the Marines. It holds 4 projectile grenades at any one time and a Marine can carry a maximum of 24 extra cartridges, making for a total ammo pool of 28 rounds.
This weapon is extremely effective against all Alien structures but due to its low ammo capacity and potential to cause damage to the operator, it is strictly a support weapon and should only be used with support from other Marines.
The Grenade Launcher is not affected by Arms Lab upgrades.
Main Article: Damage Types
The Grenade Launcher deals Structural damage meaning that while it does Normal damage to lifeforms, it does double damage to all Alien structures.