Spawning projectiles

This is probably a stupid question, so thank you for reading. I'm trying to spawn projectiles the way it's done in crossbow.cs. My datablocks are as follows:

datablock ProjectileData(LasShotData)
{
   shapeFile = "~/data/shapes/crossbow/projectile.dts";

   muzzleVelocity = 1;

   explosion = CrossbowDebrisExplosion;
};

datablock RangedWeaponData(LasgunData : WeaponPhysicsBase)
{
   shapeFile = "~/data/shapes/Imperial/weapons/lasgun/lasgun.dts";

   projectile = LasShotData;
};

CrossbowDebrisExplosion is copied straight from crossbow.cs. Don't be scared off by RangedWeapon. It behaves pretty much like a RigidShape, but I've added some methods (you'll see them below). They all work as they should.
Functions:

function LasgunData::onFire(%this,%obj)
{
   %proj = %this.projectile;
   %p = new Projectile() {
      dataBlock = %proj;
      initialVelocity = %obj.getMuzzleVector();
      initialPosition = %obj.getMuzzlePoint();
      sourceObject = %obj;
      sourceSlot = 0;
   };
   MissionCleanup.add(%p);

echo("Projectile created:");
echo(%proj);
echo(%p);
echo(%obj.getMuzzlePoint());
echo(%obj.getMuzzleVector());
echo(%obj.getMuzzleTransform());
echo(%p.getTransform());
}

All the echoed values are correct, but %p.getTransform() returns "0 0 0 1 0 0 0". When I set the camera there and fire again, I can see the projectile being created (in the editor), and immediately disappearing, without even an explosion.
Is the fault mine?