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Concentricity Gauges

Gents:

I was looking at the 21Century concentricity gauge and wonder if anyone has any experience using it. I have a Sinclair, but with necks that are not turned it seems like the idea of checking concentricty on the inside of the neck might make sense. Are there other good alternatives?

I have seen the article on the Rifleman's Journal, but this one is not included.

Thanks, MIke
 

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