Parts for the old M98's are still available. I like www.tippmannparts.com.
I have one old M98 (late 1998 or early 1999), and one 98C (2002). There are only a few parts that will not work between the two guns.
1. Some old M98's had a metal power-tube. If you have a metal power-tube, you cannot use 98C front bolts, stock or after-market. You cannot use a 98C plastic power-tube in a M98 without modifying either the power-tube or your receiver. You can order a M98 plastic power-tube and will be able to use after-market front bolts. If your M98's currently have a plastic power-tube, you are good to go...
You only need to install the plastic if you want to replace the front bolt with an after-market part. The older metal power-tube was a slightly larger diameter. If you're still running the stock front bolt, stay with the metal tubes. I think it was a better design.
2. The trigger & trigger spring were changed. Make sure to replace with the M98 Trigger & Trigger spring.
3. Sometime during the 98C period, the sear & sear spring were changed. I am not sure if the new design will work in an older M98 or 98C. It's possible they moved the locations of the dowel pins. Order a Sear & Sear Spring for a M98 or old style 98C.
4. You cannot use a Double Trigger, Response Trigger, E-Trigger, or Cyclone Feed on a M98 without modifying the receiver. And stay away from ACT specific upgrades.
There have been a bunch of other parts that have been re-designed, but as far as I know, the re-designs work in the M98. All parts in the Tippmann Parts Kit, and O-Ring Kit should be able to be used in either gun without an issue.
I hope I didn't over-look anything.
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