How do you tell if a Garand gas cylinder is out of spec....??

[pastprime]

What is used to measure/gauge the gas cylinders? Is there a way to accurately do this using common workshop tools? And what is the minimum inside diameter before they are out of spec?

Reason I ask is that I recently aquired a few and want to verify that they are serviceable before I offer them for sale.

Edited: found what I needed to know.

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