Yup, tried to do it, got the results I've been spewing about for a while, but not enough test shots (due to my own stupidity, my mags were in the car and were cold, so I only got about 6 good shots from one mag before it got weak, then a couple crap shots before the gas spewed out. Other mag, I think I got two good shots out of before it spewed gas). Will redo my test when it's warmer out, and my mags are raring to go.
Ammo used were Straight 0.30g BBs (with the graphite coating washed off) and 0.29g Super Grand Master BBs. KSG G19 with metal slide, Guarder Enhanced Recoil Spring & Guide, Guarder metal mag catch, Guarder Enhanced Hammer Spring and Head 1950 6.04mm tightbore. Propane was used as always.
Anyways, check out the pics: