Diameter of the magazine tube

[thegoulais]

I'm looking at accessories for a 320 security 20 gauge. But I need to know the diameter of the magazine tube. Any ideas where I can get this information?

[Robinhood]

ID or OD? Do you have any dial calipers or a tape measure?

[BeAnalog]

What kind of accessories? I have one of the same gauge too. I'd like to add accessories as well.

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