How to setup a co2 system?

[Fishnerd360]

Not sure how it works in your area. Is it cheaper to refill/buy a fire extinguisher than a gas cylinder? I've seen people using fires extinguishers rigged up to regulators.

Also a lot of Chinese made Co2 regulators and accessories go for cheap on line these days. Not the best but does the job.

Looks like around the same prices for both, around $15 for 2lbs, but also looks like I’ll have to ensure a tight seal with the fire extinguisher. I’ll look into cheaper regulators and see if I could try and get stuff under $100 for a future project.