Go ahead "flame" away at my suggestion, I don't go to a "range" with others overseeing my every move. My 800 acres is plenty private.
No way will the barrel be hot enough to ignite the gas unless you have the hose flowing when you immediately open your bolt, and then I still don't believe it would be hot enough. One quick blast would cool the barrel plenty, I guess I have time to let my barrel cool though. Me being slow and all.