What is the difference between inches, millimeters and caliber when talking about guns?
In: Engineering
It’s a measurement of the internal diameter of the barrel of the gun. Caliber uses imperial units as a fraction of an inch. For example, a .40 caliber pistol has a barrel diameter of 0.40 inches. Millimeters is metric, so a 9mm pistol has a barrel diameter of 9mm.
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