From The TimeSplitters Wiki

Lasergun
Ammo	50 seconds of charging or shield
Fire Rate bullets per sec/cartridge time	?
Reload Time	N/A
Damage (per Single Shot) Head/Body/Leg	?
Type	Other
Zoom	Yes
Primary Fire	Fires single shot or charge shot if fire button is held.
Secondary Fire	Shield
Games	TS2

The Lasergun has appeared in TimeSplitters 2. The Lasergun's primary fire is a single laser shot, which can be charged up for a more powerful shot when the fire button is held down. The alternate activates a shield that will partially protect the front of the player's body from bullet fire, although explosions and shots to the legs or the back will still do damage. When crouching, the head is not protected by the shield.

Noise Glitch

If a player charging the Lasergun gets killed, the charging sound may continue after the player's death. The Lasergun sound will get stuck in the specific spot where the player with the Lasergun died, so the closer you are to that spot, the louder the charging sound is. The only way to turn off the sound is to end the match.

A similar glitch happens with the Minigun.