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What would be a good alloy/ dimensions for an aluminum blowgun? Answered

I would like to order an aluminum tube from McMasters.com but I'm not sure of what kind I should get for a blowgun.  If you could put in the dimensions you would get for a blowgun at http://www.mcmaster.com/#aluminum/=7mdkul that would be great, thank you. 

The only set thing I need for the tube is for it to be less than a .50 cal blowgun...

If you could tell me if this would be good for a blowgun that would be great: http://www.mcmaster.com/#aluminum/=7mdm28