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The inside diameter of a firearm barrel and the outside diameter of its bullet measured in hundredths or thousandths of an inch (ie, .45cal/caliber) or millimeters (ie, 9mm).

The information contained on this website is provided as a service to USCCA, Inc. members and the concealed carry community, and does not constitute legal advice. We make no claims, representations, warranties, promises or guarantees as to the accuracy, completeness or adequacy of the information disclosed. 

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