SpudFiles

I've been thinking of using a normal CO2 tank, like you would see for paintball (I believe 20 oz), for an inline vortex BBMG. At 80 PSI does anyone have an estimate how many seconds total the gun will fire before there's no gas left?

i paintball but i not that good with this stuff but on my mind i would say more than 20 mins depending how full the tank is
some places don't fill them up all the way

No where near 20 minutes.

You'd probably be able to unload your gun few times on a fill, but any more than that I can't say for sure.

Thanks that's about what i was hoping. If I haven't put those thousands of rounds to good use I shouldn't be using the dang thing anyway.