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Old 02-05-2007, 10:19 AM   #1 (permalink)
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Velocity Adjustment on CCM guns

I prepared this using my SS-25 for posting at SCP. I figured the information would be good to post here as well. There has never been any documentation with the CCM guns so online is all there is.


Start with the backblock facing you


Pull the pump arm towards yourself opening the space between the back block and the IVG (The IVG is the velocity adjuster, the disk with the three holes you can now see in the picture)


Insert a 1/8" allen wrench into one of the little holes. You may need to wiggle it around to get it to seat.


Rotate the IVG (the disk with the holes).
Right = IVG in = Increased Velocity
Left = IVG out = Decreased Velocity

-If your turn the IVG to the right (righty tighty) you increase the compression on the spring when the sear is tripped. You will therefore hold the valve open longer and increase velocity.
-If you turn the IVG to the left (lefty loosey) you decreased compression on the spring when the sear is tripped. You will therefore open the valve for less time and decrease velocity.



Remove the allen wrench, place it back where it belongs so you don't loose it


Return the pump arm forward and see if you've changed velocity enough.

-rat
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Old 02-05-2007, 10:29 AM   #2 (permalink)
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Also for those of us that have cocker/snipers with threaded lower tubes for the IVG you can get this type of adjuster for them, it makes spring velocity adjustments alot easier!
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Old 02-05-2007, 11:01 AM   #3 (permalink)
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Nice job! Now you gotta add a "Part 2" w/ more pics of you adjusting your velocity using the vertical reg.
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