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the part so far that has to be made of metal is the barrel, but people have been playing with ceramic to make barrels with.
They had an all plastic gun in the movie Line of Fire, but there are no all plastic guns available right now
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Carbon is not the problem, it makes up 0.041% of our atmosphere , 95% of that is from Volcanos and decomposing plants and stuff. So people in the US are responsible for 13% of the carbon in the atmosphere which 95% is not from Humans, like cars and trucks and stuff and they want to spend trillions to fix it while Solar Panel plants are powered by coal plants
think about that
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