Before I tuned it it was doing almost 700FPS with 7.9, then the spring broke. MM sent me a new shorter stouter spring and I got 750 out of it but that didn't last, as it dropped off to about 700. So I decided for the Quest spring bringing the 7.9s back to 750fps. I have been considering adding a little weight to the top but just don't want a harsh firing cycle. Maybe cut off a coil then add weight? Just don't know yet.
OH BTW I had over polished the tube at one point and had to go back and cross it better, then I found I have a gouge in the tube I bet it leaks.
This message has been edited by DMikeM on Nov 14, 2010 8:39 PM
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