Any time a choke tube "blows out", it's likely it was either not screwed in tight or was a bad installation that left the tube protruding into the bore, so the wad and load caught it. That and pressure behind will do it. If the installation is correct and the tube is scewed tight against the shoulder in the barrel, there's no reason the above should happen. I would bet the Perazzi installation was correct(assuming it was from the factory). I would not be quick to bet on a correct installation from a Mossberg or their imports.
