Quick on for everyone chrono'd mine today and it was shooting at 390-380 for the first 5-10 shots of the mag then levelling out at around 365-355 for the rest of the mag, that was on standard green gas. Did a little testing and manage to get it down to averaging 340-330 FPS by screwing in a small screw on the back of the flute valve then filing it down a bit to space it forward. One think though is you only need to space it forward by about .2mm-.3mm for the drop in FPS which is why I had to file the screw head down.