I suppose I have one more interesting note to add. The most common gas used in PC duster gas is 1,1,1,2 tetrafluoroethane, which is what we know as HFC 134a, and what comes in any can of 134a that you buy from an airsoft store. However, some PC duster uses difluoroethane rather than 1,1,1,2 tetrafluoroethane. After hearing reports that difluoroethane puts out more power than 1,1,1,2 tetrafluoroethane, I decided to hunt down a can (it took stops at about 6 stores before I could find it) and run a little test. Using my WA Wilson Combat (SCW 1) and .20g bbs, I ran 10 shots of each gas through my chrono. I allowed the mags equal time to warm between starting the tests, as well as an even two seconds between each shot. The difference? Difluoroethane put our a paltry 5 FPS more than the 1,1,1,2 tetrafluorethane on the first shot. Nothing big there. What was interesting, however, was the difference in cool down between the two. From the first shot to the last, the difluoroethane only lost 3 FPS. The 1,1,1,2 tetrafluoroethane lost 12 FPS. That's over the course of 20 seconds with a bit of warm up time in between shots. If you extrapolate that to say, 6 shots over a two second time, and you're going to see a significant cool down effect in the 1,1,1,2 tetrafluoroethane, but a far less noticeable cool down effect with the difluoroethane. It's not a huge deal, and if you can't difluoroethane your performance won't exactly be hurting. But for those of you who prize consistency, which is so hard to get in a GBB, difluoroethane will get you one step closer than 1,1,1,2 tetrafluoroethane.