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lol it does suck that the early adopters always get screwed
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I bought one for a Gen 1 (by accident). It is just a raw barrel, that you mount in your barrel extension, then it becomes a quick change barrel. Looking at the barrel after I got it the only 3 things that can be Gen 1 or 2 specific is the feed ramps are milled differently, or the headspace is wrong, or the mounting pin locations have changed.
It was just delivered this week, I'll pull my Gen 1 barrel out of my MPX this weekend and take some measurements to see what the differences are.
ETA: I just pulled my Gen 1 barrel, and all the measurements are the same as this Gen 2 replacement from ILWT. I can't see any reason it wouldn't work. I'm going to install it then measure headspace to make sure it isn't wildly off or something.
ETA2: Well, the damn thing slid in like butter and installed like it was a factory Sig part. Now I just need a 9mm go/no-go gage set and I can see if it is safe to test fire.