I'm looking into the Tacamo mag conversion kit because I think it's a cool concept. Plus theres big games popping up around here that have specific mag only rules. My question is instead of buying the whole $100 kit could I just buy either of these to accomplish the same thing?.. I'm not sure if these kits actually feed paintballs or not.
Your first link leads to a dummy mag. All that magazine does is replace for froegrip.
Your second link leads to the adapter kit for the MKV. RAP4 sells the MKV in 2? ways, kit and hopper. The adapter kit transforms the RAP4 MKV into a mag-fed marker as the MKV is designed to go both ways. You can actually just buy the MKV from RAP4 pre-assembled for hopper style, and this is the adapter that should really already be included with it.
You would need to buy the kit and transfer your internals from your 98C into it. The kit comes with both the mag-feed kit and the hopper kit.
Being an owner of a MKV kit, I was very unhappy with mine BUT I did get a low serial number, so you should be all set.