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I'm guessing that if Grotsnik switches on his PK, he strikes last, wounds on a 4+ with a re-roll, ignores saves and inflicts ID on T≤4? And if he switches it off, he strikes in I order and gets +1A for Slugga and CCW?

D'oh, I get it now, I was coming at things from a Tyranid 'upgrades to melee attacks' background that ignores the usual rules for this sort of thing

Welcome to 40K and the Orks!

You'll find that a fair number of rules are somewhat vaguely written and open to interpretation. The writers are only human, after all.

In this case, the rules as written are pretty clear, as I realised over the course of the thread: "An 'Urty Syringe is a Poisoned Weapon..." Ork Codex, pg38