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While looking at weapon systems I came across the 30mm ASP which some light internet research revealed is a gas operated weapon. What does this entail -what type of gas does it use? I'm sure its' not gasoline, so I'm imagining metal 'bottles' like a welder uses. How often would you have to top these off?
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Well here is more data on it.
http://www.army-guide.com/eng/product3643.html