-extremely air efficient
-also works with CO2 with the right reg
-works with any air/nitro tank with the right reg.
installation was a snap if you know the internals of your marker. total time spent: about 10 minutes (once I fixed the 2 problems. hopefully most wont have to do this)
when I recieved it, two things were defective.
One: the cocking rod was not alligned properly with the hammer so when the hammer slid back and forth, it was crooked in the chamber, causing to much friction to cock the gun. I had to bend the cocking rod to straighten this problem out.
Two: the vertical adaptor T (where the lowpressure chamber and the valve connect) was appx. 90%% blocked by an excess of pipe coming into the T joint. When I first installed it and aired up the marker, it took 600+ psi for the marker to recock itself. I called tippmann and they told me to check for the previously decribed blockage. sure enough, once I drilled that out, the marker works perfectly with 300 psi !!!! thats not a typo! three hundred psi ! Apparently, there have been many reports of this problem, so if you need alot of pressure to shoot (more than 400psi) then you might want to check this out.
Assuming you get a non-defective kit, this upgrade is the greatest thing you could ever do to a m98/98c.
You must buy a regulator that will reg down to 300 - 400 psi. without this you will not be able to make the marker shoot under 300 fps. I am using a ANS Gen-X running 300psi with an ACI bulldog nitro tank preset at 850psi. The ACI tank is notorious for shootdown (shooting faster than the tank can supply air) but since the operating pressure of the marker is now 300 - 400 psi, you cant outshoot the tank. (with a decent reg)
Ignoring the defective parts, This kit is incredible. I am giving it a ten because Im sure the defects were a fluke, and if the kit came to me in working order I would definately give it a ten, so that is the way I will judge it.