SpudFiles

I was looking around and I found a post on this
topic that said

Co2 is a no no with pvc. Remake it with copper then you can use co2

I was just wondering if this is true.

Thanks,

jwilson7

It's true. CO2 supercools when it expands, and PVC gets very brittle at low tempurature. Not safe.

But this wouldn't be true for a BBMG right?

jwilson7 wrote:But this wouldn't be true for a BBMG right?

Actually, a BBMG would be the worst case. You're dumping lots of CO2 through the gun when it fires and it'll freeze up pretty quick.

CO2 should be fine for a semi-auto or single shot setup. A metal expansion chamber will help warm up the CO2 before it is injected into the chamber.

Haven't there been tons of regged CO2 bbmgs already? Ya know, like the "ultimate inline". BBMGs tend to run at low chamber pressures by nature.

I generally don't even worry about cold pvc since I use eye protection, but when frozen exploding cannons become an epidemic I'll be sure to watch out.
For now, I can't remember a single case of a cannon exploding from very low temperatures.

Plus, a BBMG is typically operating at 15~20 PSIG (even if the reg is set much higher, say 120 PSIG).

Everything is fine, though the gun might ice up. Only problem is, what happens if a round jams in the barrel?

I would worry more about the potential high pressures of CO2 in PVC before I would the coldness of it.