Projectile timed explosion or collision question

Hi,

Sorry, if this seems like a simple question but I'm still picking up on the Torque scripting.

My question is how to make a projectile explode using a timer or delay I know about using the settings below (modified rifle.cs) but what I'd like to do is have a projectile start a timer during the onFire action (or where appropriate) and use the onCollision action if there is one, else have a timed explosion (in air for example). Anyone know the best way to go about doing this? The arming delay below still needs a collison to cause the explosion.

armingDelay = 300;
lifetime = 5000;
fadeDelay = 1500;
bounceElasticity = 0.3;
bounceFriction = 0.2;
isBallistic = true;
gravityMod = 0.10;

function RifleProjectile::onCollision(%this,%obj,%col,%fade,%pos,%normal) // (%this,%obj,%col,%fade,%pos,%normal)
{// Apply damage to the object all shape base objects
if (%col.getType() & $TypeMasks::ShapeBaseObjectType)
%col.damage(%obj,%pos,%this.directDamage,"RifleBullet");

// Radius damage is a support scripts defined in radiusDamage.cs
radiusDamage(%obj,%pos,%this.damageRadius,%this.radiusDamage,"RifleBullet",0);}