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When you upgrade to the prime, does it have both Containtment spines, and Bio Pulse?

No; the rules for one replaces the stat line of the other. Just 12 shots.

I disagree, because it says Prime only on one weapon, but it doesn't say anything about removing the former weapon, only that the Trygon doesn't get the upgrade weapon

I'd take the 18 shots indeed

Sorry I've just read the underline of the rule that says the Prime uses the following profile when firing its Bio pulse, you are correct Nos. Thanks