I can tell you from personal experience Frank, the gas tube doesn't give out. They're stainless steel for a reason. Even Blank ammo will turn them red hot in a few rounds and then they glow for w bit after. They're protected in there and as long as you don't fiddle with them while they glow, they'll return to correct after. Just like a self cleaning oven. That's how they work anyway, they get good and hot and blow all the carbon out, for the most part.
Jim, Now why would you think I would do something like that, hahaha. I would need you here to operate the Camera. But your right about one thing, if I have to drive almost 2 hrs to the Ranch i'm going to take about 5 to 6 hundred Rounds of ammo with me and have some fun and come home empty. Its not worth it to go way out there and shoot 3 mags. I would have to wait too for a drizzly day or after real heavy rain the Brush is so dry I'm scared I'll burn my place up with all those flames. Hahaha.