1 Quick BBMG Question

[jwilson7]

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

[SEAKING9006]

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

[jwilson7]

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

[jimmy101]

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.

[Fnord]

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.

[jimmy101]

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?

[starman]

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