MWx 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. x is the number after the weapon's MW, e.g. MW3.
Px Each time a friendly operative makes a shooting attack with this weapon, in the Roll Attack Dice step of that shooting attack, if you retain any critical hits, the weapon gains the APx rule for that shooting attack. x is the number after the weapon's P, e.g. P1.
Limited This weapon can only be selected for use once per battle. If the weapon has a special rule that would allow it to make more than one shooting attack for an action (e.g. Blast), make each of those attacks as normal.