Upgrades for my original Spyder Victor?

Ok I have a Spyder Victor that I got at a good deal for my first gun. I don't plan on dumping a bunch of money into it (I'm getting a BT in a couple of months), but I was thinking of getting an expansion bay that would help a ton for accuracy seeing as Im running it with CO2. My problem is that I can't seem to find any info on one that will work with my gun. Anybody know of anything?