The caliber of the firearms is typically determined by the bore diameter measured from C. Two opposite lands. The caliber refers to the internal diameter of the firearm's barrel and is usually measured between the tops of the lands (the raised areas of the rifling) rather than the grooves.
The caliber of the firearms can be determined by the bore diameter measured from
A. Rifling
B. Two opposite grooves
C. Two opposite lands
D. Lands and grooves
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