High-pressure air (HPA) delivers consistent pressure in any weather and is required by most electronic markers, so it is the better choice for nearly every player. CO2 is cheaper to buy and fill and works in many entry-level mechanical markers, but its pressure changes with temperature and rapid firing can cool it, causing velocity swings. Check what your marker supports and what your field fills.
Every paintball marker needs an air source. Your choice affects consistency, cost and which markers you can use.
Side by side
| HPA (compressed air) | CO2 | |
|---|---|---|
| Consistency | Very consistent | Varies with temperature and rate of fire |
| Cold weather | Unaffected | Pressure drops |
| Marker support | All markers | Many mechanical markers only |
| Tank cost | Higher | Lower |
| Fill availability | Most fields and shops | Fields, some sports stores |
| Tank checks | Hydro test date, service life | Hydro test date |
Why most players choose HPA
Air pressure is regulated, so shot velocity stays steady. That means better accuracy and fewer chronograph problems. Electronic markers rely on it.
When CO2 makes sense
- You own an entry-level mechanical marker rated for CO2.
- You play occasionally in warm weather.
- Your local field fills CO2 cheaply.
Tank safety
- Check the hydro test date and service life on the label.
- Never leave tanks in hot cars.
- Fill only to the rated pressure at a field or qualified shop.
- Use a tank cover and keep regulators and o-rings maintained.
Read about paintball mask ratings before your first game, and see what to buy first. Browse air systems.
Common questions
Can I use CO2 in any paintball marker?
No. Many electronic markers are HPA only, because liquid CO2 can damage their internals. Check your marker's manual.
What do 3000 and 4500 psi mean on an HPA tank?
The maximum fill pressure. 4500 psi tanks hold more air for their size, but some fields can only fill to 3000 psi.
Do HPA tanks expire?
Carbon fiber cylinders carry a hydrostatic test date and a service life set by their certification. Fields will not fill out-of-date tanks.
How many shots will I get?
It depends on tank size, fill pressure and marker efficiency. A common 68 cubic inch 4500 psi tank often gives several hundred to over a thousand shots.