APx Each time a friendly operative makes a shooting attack with this weapon, subtract x from the Defence of the target for that shooting attack. x is the number after the weapon's AP, e.g. AP1. If two different APx special rules would be in effect for a shooting attack, they are not cumulative - the attacker selects which one to use.
Splash x Each time a friendly operative makes a shooting attack with this weapon, in the Roll Attack Dice step of that shooting attack, for each critical hit retained, inflict x mortal wounds on the target and each other operative Visible to and within ⬤ of it. x is the number after the weapon's Splash, e.g. Splash 1.