What fits in a 1/4" copper tube?

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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AnotherSnappedLine
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Does anyone know the Inner Diameter of 1/4" ...I would love to know what I can use for .177 or .22 pellets.
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jackssmirkingrevenge
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I believe it's 0.177" BBs that are used with 1/4" brakeline, but it depends o your specific pipe.
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omniscient
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1/4" Steel Brake line has an inside diameter of 3/16" (0.188)

1/4" Galvanized or "Black Iron" pipe has an I.D. of 0.364"

1/4" Copper "K" pipe: 0.305"

1/4" Copper "L" pipe" 0.315"
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AnotherSnappedLine
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This should do it:

http://www.mcmaster.com/#steel-tubing/=b0jgop

:D
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AnotherSnappedLine
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OOPS, I need the serial number... 89955K21
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