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I found this company doing a google search. They make aluminum pipe with and Inside Diameter Tolerance of +/-.001". Pretty cool! I don't know what they charge, but .001 is pretty darn good! That means that a pipe ID would be no larger than .501 or smaller than .499. Cant hardly beat that!!

http://profileprecisionextrusions.com/extruded-aluminum-tubing.php
 

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It's a nice start but really requires precision ammo to reap full benefits. I would definitely obtain a healthy cache of ammo first to assure I knew what size tube I wanted. The fifty caliber darts I've purchased (three or four hundred) varied in size by at least four or five thousandths. I couldn't tell you the average because measuring a very thin and flexible lip is tricky but I think a few thousandths less than .5"
 
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