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.
Lethal x Each time a friendly operative fights in combat or makes a shooting attack with this weapon, in the Roll Attack Dice step of that combat or shooting attack, your attack dice results of equal to or greater than x that are successful hits are critical hits. x is the number after the weapon's Lethal, e.g. Lethal 5+.