Ok, I spent some time looking over the G2 in question tonight. The conclusion I have reached is that the body IS Surefire, but like some have said, the LED drop in is just a run of the mill CREE. I based this on of all things the gap at the tail cap. Even with the tail cap screwed all the way down, there is still a significant gap between the bottom of the tail cap and the associated shoulder on the body. I saw this on my known good G2 with a third party drop in. The length of the drop in is just long enough that the three parts of the body do not come together as they should as seen when using an original P60.
In any case, I am happy with my purchase, and have plans to replace the current single mode drop in with a higher quality Nichia 219 multi-mode one. I am leaning towards Mountain Electronic's CUXM/CUXP drop in since I have one in one of my other lights and really like it. I also really like the under $20 price tag and the workmanship Richard puts into it. I do wish there were still some 219B LEDs still floating around, but the 219C seems to be okay.