Killzone Question

I've been playing Killzone for the past few hours,
but i cant figure out how to hit people with your gun.
i know you can because it shows it on the trailer,
so what button is it that makes you do that.
and is it only with certain weapons.
Alright Thanks

wouldnt that be in your 'instruction manual' or maybe even the tutorial mode?.. o_O..

|||| Here are the default controls for Killzone which are the basic controls you'll
see in a shooter. Although, there are some different things such as sprint and
combining Action and melee attack. Don't like the set up? Fear not, Killzone's
controls are customizable.

L2-Change Stance R2-Fire Secondary Weapon Use
L1-No use R1-Fire Primary Weapon Use

Up-Zoom in(Sniper) Triangle-Reload
Down-Zoom out(Sniper) X-Action/Melee attack
Left-No use Circle-Change Weapons/Equipment
Right-No use Square-(Hold)Talk(HS)

Start-Pause Select-Objectives

L3-Sprint R3-Zoom ||||

got this info from http://db.gamefaqs.com/console/ps2/file/killzone.txt

Ok Thanks

[edit]