[AoiShikaku]

Ok just thought I'd finish up a solution for those who search this thread:

-Springs were linear so I couldn't use the turn method wrath had mentioned
-Ran a few thousand rounds though the machine (2-3 FPS drop)
-Didn't hit the cock release over night (leaves the spring in full tension [0-0.5 FPS drop])
-Took a hacksaw and chopped off about 1.5cm to 2cm from the spring (10-15 FPS drop)

now the gun averages out at 340-345 FPS.
Random spikes and drops (1/10 shots) 335 FPS to 350 FPS (on the dot)


Now I've got a gun ready for 350 FPS below games in Toronto =)