Well, I remember reading on a US forum (probably GTA Benji/Crosman Gate) last year that Crosman had "cheaped" out the latest version of the Phantom. I don't believe this has affected the detuned versions for Canada. Anyhow, just read this post on the GTA:
http://www.gatewaytoairguns.org/GTA/index.php/topic,27291.0.html
It shows the new Phantom's have the plastic trigger blade, so the GTXII (and similar Gamo replacements) won't work in them.