The las gun doesnt have a value for the AP spec, meaning it has an AP value of nil. this means that this gun does not negate armour saves against anything. im not to sure at what it does to your armour penetration roll though.
I think it's important to note here that in terms of vehicles the AP - means that you can only score a glancing hit, not that you cannot damage the vehicle. That may also be the case, but that's determined by the weapon's strength.
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