Vulcan .25

Hi guys.
i have done same changes for my Vulcan , and i am happy about it.
i have tite valve spring 1/4 turn and the gun gets much better.
more quiet, more accurate and more powerful.
write know i have 270m/s and i steel can go up or down...
i know that on different velocity is different bc and the highest is not allways best.
so i will try to find out whats best velocity is for my gun.