Projectile going straight ahead

Here is a easy question for ya:

Using the onImageFire function provided with starter.fps, i want a projectile to go straight ahead from the playerObjects facing, and not from the muzzle point. I have tried replacing:

%muzzleVector = %obj.getMuzzleVector(%slot);
With:
%muzzleVector = %obj.getEyeVector();
And:
%muzzleVector = %obj.getForwardVector();

Neither functioned the way i want it to, what am im doing wrong here? have i missed out on something entirely?

%muzzleVelocity = VectorAdd(
VectorScale(%muzzleVector, %projectile.muzzleVelocity),
VectorScale(%objectVelocity, %projectile.velInheritFactor));

The vectorAdd function only increases the speed right, it does not affect the projectiles facing at all?

Thanks for your time