Alternate Fire

Secondary fire is a feature of some weapons, performing a different action than their normal fire modes. Currently only five weapons have distinct secondary fire modes.

As of Update 17, secondary fire is bound to the middle mouse button on PC. On PS4 it is unbound by default. Prior to Update 17 secondary fire used the aim button.

Weapons that have a secondary fire mode are listed below.
 * Tigris
 * Primary fire will fire both barrels of the Tigris shotgun in rapid succession. The primary fire button can also be pressed and held down to fire one shot, then released to fire a second.
 * Secondary fire will fire a single barrel in a semi-automatic fashion.
 * Penta
 * Primary fire launches a grenade in a ballistic trajectory which will bounce off walls and enemies. Up to 5 grenades can be launched at once. A grenade hitting an enemy will deal a small amount of damage.
 * Secondary fire detonates all active grenades dealing damage.
 * Quanta and Quanta Vandal
 * Primary fire projects two laser beams dealing damage.
 * Secondary fire shoots slow moving cubes that bounce off walls and other environmental objects. When contacting an enemy or being shot at they detonate dealing AoE damage.
 * Mutalist Quanta
 * Primary fire shoots full auto hitscan bullets dealing physical damage.
 * Secondary fire generates a slow moving cuboid sphere that deals damage to nearby enemies, causes bullets that pass through it to deal additional  damage, and explodes after a short time dealing AoE damage.