Thanks guys. Does the 1720 have an air stripper & would it fit the 1701p barrel?
During my next step tuning down the hammer energy and stroke, I realized that the gun I had may been tuned up quite a bit so that I felt it was quite loud. I do have a crony but have no time to set it up yet. So I simply watched the grouping of 3 shots to adjust the hammer. I was able to turn CCW hammer sprint tension screw 3 rounds and CW stroke screws 3 rounds to reduce quite a bit striker energy. Now the sound of pellet hitting paper targets (with soft sponge behind it) is even louder than the barrel sound with LDC. And after about 30~40 shots, the pressure is only down from 2.6kpsi to 2.5kpsi. I'd be interesting to see how low can I shoot with still good grouping. Before I adjust hammer, I got very nice grouping between 2k to 1k psi, but >2kpsi the grouping is much wider. That was why initially when I got the gun I felt the accuracy was quite bad.