From The TimeSplitters Wiki

A futuristic machine gun that has an increasingly higher rate of fire power until it overheats. It then needs to cool down. As a secondary fire it shoots plasma grenades.

Plasma Autorifle
Ammo	200 energy cells/20 plasma grenades
Fire Rate bullets per sec/cartridge time	N/A
Reload Time	N/A
Damage (per Single Shot) Head/Body/Leg	N/A
Type	High Fire Rate/Grenade Launcher
Zoom	Yes
Primary Fire	Fires energy cells
Secondary Fire	Fires plasma grenades
Games	TS2

The ultimate fighting weapon of the future, made of solid titanium, it can let lose rapid rounds of fire as well as firing off time-delayed grenades. Be careful that you don't over-heat, giving the enemy time to attack.