1/How many paintballs fit in the Tippmann TMC Magazines?
The TMC magazines hold 20 paintballs.
2/Can I use hopper and magazines at the same time?
No, you can only use one or the other, if you attempt to use both the marker will jam and will not be operational.
3/What barrel can I use on the Tippmann TMC?
the TMC can use any 98 threaded barrel, however depending on the milling and design of it, it may not fit inside the shroud.