velocity issue on a fairly stock CPro.

OK, so.
heres the story. I've had the marker for about 2 years now. For the past couple of months, I haven't been able to get it to chrono over 250 (260 once), and it shoots down horribly (i need to wait about 5 seconds to get a second shot less than 15 FPS lower than the first).

I've tried 3 drive springs, including the red (stiffest) spring from the maddmann kit. ive also replaced the hammer o-ring. neither of these things helped.

I think it might be my air tank. Its output pressure is (at least is labelled as) 850 PSI. So theoretically that should work, but I have a baseless suspicion that the tank/macroline is to blame. Is this possible?

Finally, because I know someone will ask, I do NOT have an RVA, secondary reg, or stock. And I've adjusted the FVA from all the way in, to on the verge of falling out. Nothing made it fire above 250.

Any ideas?

Thanks in advance.

both valve screws in.

so your confirming my guess then?
damn. thats probably the most expensive thing it could have been :P

its about a year old.
i think their out of business though now.
there website is definitely down. and who/what is kee?

i checked the kee website, nothing about AA there.
hmm...

EDIT/UPDATE: I gave the marker an insanely intense internal cleaning () and switched from 3-in-1 oil to a proper marker oil. Because I clean out the internals fairly regularly (every few days of play), I'm fairly certain the oil is what did it.

im amazed how much the change of oil type helped, im shooting more consistently then ever and the velocity is now perfect. When I first chrono'd in it was shooting 300 (on the dot actually...), and i had to bring it DOWN to 250 cause of field rules. it feels great to have screw the FVA IN instead of out in order to get to correct velocity.

just thought I'd let ya know.


Edited by Ilford Rule - 26 December 2007 at 9:33pm

Try this.

(1)Loosen all the screws, retighten just enough to hold. 'Not Tight'

(2)If that's yours in the sig, try it without the Rocket Cock.

Good luck