I just swapped in a super light valve spring and a much lighter hammer spring. I have not Chronographed yet, but it looks like ~280fps. The pump stroke is super light now. I have also lightened the sear spring with great success. Swapped the trigger spring. Shimmed the trigger to reduced side to side play and i have polished nearly everything that moves. 100$ gun shoots like a 300$ gun. Next i want to start playing with the valve.
This gun is super easy to improve on. Nearly everything is unfinished and over sprung from tippmann.