Originally Posted by half-step
Make sure the marker is clean and lubed. Then try one spring at a time. Try a harder main spring and see what your velocity is. What is your fps at this time? You need to do this at a chrono. A harder main spring can also make it a little more difficult to recock.
If your velocity is still not high enough, then try the softer valve spring. It is a step by step process.
dono for sure what my fps is but i know for sure it was to damn slow compared to the other guns at the field (just out in the woods ). and they have had their chronoed and we compared them. The closet field around here is about 80 miles away