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For all the hicapa enthusiasts, ive been having this FPS problem for the longest time and i cant seem to figure it out. My hicapa it shooting either 330fps OR 200fps... its always one of the other. I cant for the life of God get it to fire consistently at 330fps, and i figure there must be something loose if the FPS fluctuates between the two numbers. Anyone experience this issue before? Here is what I tried so far:
1. Manually pushed the magazine up while firing to ensure good seal between mag lip and air nozzle.
2. Swapped an SD air nozzle with Action and guarder air nozzle to ensure no cracks.
3. Changed the piston o-ring to a slightly thicker one (custom made myself) to ensure that gas doesnt escape rearward when gas is initially discharged to propel the bb.
4. Ensured hop up rubber forms a tight seal with inner barrel by wrapping the two together with teflon tape.
5. I also tried various hop up rubbers (King arms, nine ball, stock) to see the effects...FPS goes up and down depending on the rubber.
6. Tightened the hop up dial (tightened the hop up chamber screws all the way) so that the hop up position doesnt change when bb is discharged.
Is there anything else I shouldcheck? floating valve? hop up arm? I have a strong feeling it has something to do with the hop up arm, any slight deformities to it will affect the hop up applied, and hence the fps.
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