J&J barrel and a hopper adapter seem to be the only upgrades around.
Acurate, easy to clean, light, durable, air efficient
Pump (but you should know that), not many upgrades, have to get a hopper adapter
I had decided that I wanted a pump to help me improve my game. I searched around and found the SL-68 II to be the most recomended one. I got onto ebay and bought a really early one. I got it and it looked in bad shape, I opened it up and everything looked fine so I tested it out. It was very acurate and I was using dented paintballs. I found that cleaning out the barrel is so easy.
After getting a hopper adapter I was finally able to use it in a 1 on 1 game this weekend. They had my 98c so they had way more firepower. After I got a handle for it I ended up winning the second game. The auto pump came in very handy. The gun had great acuracy and distance. It didn't dissapoint me at all.
Now I just need to get a barrel
If you're looking for a good reliable pump that doesn't cost much go with this one. It's great and I doubt it will let anybody down.