Maybe OT, but I did some messing around with my cocker today....ID V2 valve (11/16") and valve spring, ID hammer and hammer spring in my Resurrection FLE. I gauged it and it was sitting at about 160 psi, which was shooting about 280 fps with the IVG flush with the back of the body for me last weekend. Efficiency was not up to par.....I left the IVG alone and increased the HPR pressure. Max velocity was achieved around 190 psi (320-330 fps) and as I increased past that, it started to drop again. At about 220 psi, I was back in the 280 fps range. With the extra pressure closing the valve faster, I'm thinking efficiency should improve. This was done with a questionable gauge, so pressure error could be +/- 10 psi or so.