Propane is generally considered incapable of ignition at concentrations less then 2%
Therefor I highly doubt that a GBB rifle's magazine contains sufficent gas to saturate an area to that extent.
Having said this, one could still ignite the propane at its source (ie during firing) however it is neigh impossible and even if it did com bust, the amount would be insignificant and its released energy would not be enough to cause serious harm to anyone.
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