Many spyder parts interchange (springs, boards, some bolts, seals, etc...)
there are some sites such as alamocitypaintball.com that sell new cupseals and bolts specifically for draguns. Scenariodreams.com sells eyes and circuit boards for draguns (much better than stock). Spyder bodies can interchange to some degree (xtra and others). Barrels are spyder threaded. I've got a bunch of parts if you need anything.
If you have a little patience, working on draguns can be satisfying. When working right, a nice dragun can really rip. A warning though: the stock M3 style will only shoot 10 bps. The other models are capped at 20+ bps.
I've got a timmy'd dragun T1. (T1 with all bob long intimidator internals; essentially a 2k2 intimidator)
I also have the M3 black dragun (blowback). Body is machined for eyes and the eyes are installed and functioning. Marker has LCD 30bps eye board with semi/burst/full auto modes and shot counter.
I love both these guns but your ad made me think I might need to sell one or both. I never use them. email me or pm me and we can probably work something out. I have excellent feedback.