[Slono]

I just chronoed my new infinity build and a string of seven shots yielded an averaged of 327.2 fps using 0.25g BBBastards which is supposed to translate to ~365 fps on 0.20g BBs using arnie's online calculator. That's the highest I've ever seen for a standard 5.1". It doesn't have upgraded flow valves, but it is fully upgraded internally.

Edit: This time I tried stuffing a BB in the MSH and I managed to get a little more power and I also installed a TK high flow valve I got from somebody. I used ILLusion's performance readout template to display my readout. Tests were done using 0.25g BBBastards.

FPS shot string:
333.4
331.3
330.4
334.3
333.1
331.3
331.9
000.0 (error shot / voided)
328.0
327.4
325.6
324.6


Average = 330.12 FPS

High Velocity = 334.3 fps
Low Velocity = 324.6 fps
Average Velocity = 330.12 fps
Average Deviations = 9.7 fps
Energy Output (avg) = 1.26 Joules
Equivalent fps in 0.20g = 368.18 fps

As you can see, due to the high amount of gas used and the voided shot in the middle of the test it started to affect performance. The average deviation was a whopping 9.7 fps. I will have to run further tests to see it was the voided shot that messed things up since every shot was fairly consistent until that point.