Pump Kits, and YOU. (A Guide to Pump Kits) - PbNation
Are you sure you have a lightning and not a superbolt?
If its a lightning, your gonna need a 2K+ kit.
If you have the money, go for the CCM Deluxe kit.
If not, any other type will work fine. Personally, I have a ccm deluxe on my main gun, and a WGP on my back up, and both work just fine.
The CCM is by far the smoothest Ive ever used, and worth the 70 bucks.