If you are getting 700pfs+ with the rifle as is, I say you are doing pretty good. I also use a QB-78 tuned to this level, and I would only change a couple of things that I think would help. First take note of the lightened striker that Classicalgas posted, do that. That will make your rifle much more efficent, while the thing is apart shim the striker spring with a couple of washers, strighten and polish the bolt and striker, and tube. That should let you pick up a few more fps, and not use more gas. You will also notice the rifle is not as loud as before. I changed to a Probe and did not pick up much fps. I did notice the rifle was not grouping as well as it did with the drilled bolt, so I went back to that. Now rifle is shooting one hole groups again. My rifle likes 14.5 grain Superdome Pellets. If you need more power consider building yourself a PCP conversion, That will let you get all the power you need.
Bill...
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