To convert from a 16 gram CO2 cartridge to a paint ball tank.
you need a few simple parts and tools
Get a 3/4 MIP reducer with the thread size you plan to use for your hose fittings. Tractor Supply is a great place to find all the parts you need
get a standard red hose washer and some poly hose or gas line which ever you would like to use.
you will need a CO2 tank and a regulator
get a fitting to connect to the reducer it can be a barb fitting or a quick release.
Metal works but it's heavy and tips the bottle. Plastic is better because its lighter but you can have burrs.
Put teflon tape on the reducer about 3 wraps remove the cartridge holder and insert the rubber hose washer so it's flat then
thread in the reducer and check for leaks.
If you have a miller draft or coors tap then use a 5/16 washer. Remove the rubber seal inside the tap and push the long side through the washer then with the short side down put it back in the tap. Once that is done then follow the instructions above.
I know the threads are different but the reducer will thread into both taps.
if you want more then one tap then repeat and and a tee fitting. I have three taps going at a time.
I have been using this set up for over a year and filled my last 20oz tank in May since then i have pushed out 15 gallons of beer and 3 gallons of root beer carbonited all of it and I still have over half a tank CO2.
If you have any questions just ask