If you're playing field is less then 50 feet wide then that's all you really need. The co2 HP's are more expensive both for the grenades and the gas (having to buy the $70 adapter and the powerlets). The whole system is expensive enough without adding unnecessary costs. *shrug* Maybe I'd sing a different tune if I ever had a chance to use the co2 ones but I'm pretty happy with my propane ones.
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