From The TimeSplitters Wiki

Assault Rifle
Ammo	30/170
Fire Rate bullets per sec/cartridge time	6.75bps, 4.5s
Reload Time	1.7s
Damage (per Single Shot) Head/Body/Leg	100%/20%/8%
Type	High Fire-Rate
Zoom	Yes, Far
Primary Fire	Fires Continuous Bullets
Secondary Fire	Same
Games	TS1

The Assault Rifle is a standard machine gun first used in Docks in story mode. It has a fast fire rate, emptying one cartidge in four & a half seconds, and if pretty accurate. In apparence, it is a gray gun with a hand with a aiming view (not a scope) at the top. The Assualt Rifle has a zoom feature which brings up the crosshair and has a scope that goes far.

This is an all-round weapon which suits any situation, even close-combat games since it's high-fire rate can kill enemies- especially bots very quickly.

There is no difference between primary and secondary fire. Like most High Fire-Rate weapons, bots in TS1 either fire groups of bullets with a very short pause in-between or some tougher bots fire constantly untill your health is critical.