A gun is a particular piece of machinery that propels projectiles. The projectile is generally fired through a hollow tube known as the gun's barrel. The barrel's diameter, determines the size of projectile used, which is usually designated in fractions of an inch or in millimeters. Differing from the musket, most modern guns are rifled, with a series of grooves spiraling along the barrel; exceptions include smoothbores on tanks, AFVs and some artillery.
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