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I'm chair of an airsoft society at a university and we (me and our tresurer) are looking at filling the GBB glocks we have for rental and player's guns from a 5-20kg calor gas bottle. Obviously we don't really want to be flipping a 20kg tank every time we need to gas up a mag, so is there a premade solution that fits a rubber hose running off an upturned gas bottle?