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What's the difference between a 30mm tube and a 1 inch tube.

30mm v 1 Inch Tubes

Oh, about .1811024 inches, as the crow flies. But seriously, folks, in the last few years scope makers have introduced wider 30mm tubes. The reasoning behind such actions is that if a larger objective gathers more light, a larger tube should be a good idea, too.

The main consideration in a 30mm tube scope is that you will need 30mm rings. Swift rifle scopes are available in both 1" and 30mm tubes.

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