That's really twisted about the weird FPS'. Chrony's ok? Didn't load 0.25's by accident?
Is it a ported cylinder? If it's a full cylinder, the bb might be gone before it reaches top speed.
Of if you have a really long barrel on it...it might not be long enough without a full cylinder...
Stuff like that.
It's ok if the nozzle protrudes a bit, as long as it retracts a bit more before it goes forward...check that it hasn't jumpped off of the tappet plate. A full disassemble and reassemble might change it a hair. Tighten the stock screw.
Or...do what I do now...buy a G&P complete mechbox and just reshim it...LOL!
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