I had issues with one of two Type 2s in my X-Ray. One works perfectly, but the other would randomly fall out of the magazine well during positional shooting - but not prone. I think the mag in question has a retaining lip that's just a touch too small for the magazine latch on the X-Ray. Both magazines worked flawlessly in the PTG bottom metal I had in a more traditional stock prior to the X-Ray.
Edit to add - I have two Accurate Mags as well, a 10 and a 5, and neither one has ever given me a single issue. I'm firmly blaming the Alpha mag, not the X-ray.