In military parlance, a
gun is a muzzle or breech-loaded projectile-firing
weapon. There are various definitions depending on the nation and branch of service. A "gun" may be distinguished from other
firearms in being a
crew served weapon such as a
howitzer or
mortar, as opposed to a small arm like a
rifle or
pistol, but there are exceptions, such as the
USAF's
GUU5/P. At one time, land-based
artillery tubes were called
cannon and sea-based naval
cannon were called guns. The term "gun"
morphed into a
generic term for any tube launched projectile firing weapon used by
sailors including
boarding parties and
Marines.
In modern parlance, a gun is a
projectile weapon using a hollow, tubular
barrel with a closed end—the breech—as the means of directing the projectile (as well as other purposes, for example stabilizing the projectile's trajectory, aiming, as an expansion chamber for propellant, etc), and firing in a generally flat trajectory.
The term "gun" has also taken on a more
generic meaning, by which it has come to refer to any one of a number of
trigger-initiated, hand-held, and hand-directed implements, especially with an extending bore, which thereby resemble the class of weapon in either form or concept. Examples of this usage include
staple guns,
nail guns, and
glue guns. Occasionally, this tendency is ironically reversed, such as the case of the American
M3 submachine gun which carries the nickname "Grease Gun".
Most guns are described by the type of barrel used, the means of firing, the purpose of the weapon, the caliber, or the commonly accepted name for a particular variation.
Barrel types include
rifled—a series of spiraled grooves or angles within the barrel—when the projectile requires an induced spin to stabilize it and
smoothbore when the projectile is stabilized by other means or is undesired or unnecessary. Typically, interior barrel diameter and the associated projectile size is a means to identify gun variations. Barrel diameter is reported in several ways. The more conventional measure is reporting the interior diameter of the barrel in decimal fractions of the inch or in millimeters. Some guns—such as
shotguns—report the weapon's
gauge or—as in some British ordnance—the weight of the weapon's usual projectile.
A gun projectile may be a simple, single-piece item like a bullet, a casing containing a payload like a shotshell or explosive shell, or complex projectile like a sub-caliber projectile and sabot. The propellant may be air, an explosive solid, or an explosive liquid. Some variations like the
Gyrojet and certain other types combine the projectile and propellant into a single item.
Terminology
The use of the term "
cannon" is interchangeable with "gun" as words borrowed from the French language during the early 15th century, from
Old French canon, itself a borrowing from the Italian
cannone, a "large tube" augmentive of Latin
canna "reed or cane". Recent scholarship indicates that the term "gun" may also have its origins in the
Norse woman's name "Gunnildr", which was often shortened to "Gunna". The earliest recorded use of the term "gonne" was in a Latin document circa 1339. Other names for guns during this era were "schioppi" (Italian translation-"thunderers"), and "donrebusse" (Dutch translation-"thunder gun") which was incorporated into the English language as "blunderbuss". Artillerymen were often referred to as "gonners" and "artillers". Early guns and the men who used them were often associated with the devil and the gunner's craft was considered a
black art, a point reinforced by the smell of
sulfur on battlefields created from the firing of guns along with the
muzzle blast and accompanying
flash.
In military use, the term "gun" refers primarily to
direct fire weapons that capitalize on their velocity for penetration or range. In modern parlance, these weapons are
breech-loaded and built primarily for long range fire with a low or almost flat
ballistic arc. A variation is the
howitzer or gun-howitzer designed to offer the ability to fire both low or high-angle ballistic arcs. In this use, example guns include
naval guns. A less strict application of the word is to identify one artillery weapon system or non-machine gun projectile armament on aircraft.
The word
cannon is retained in some cases for the actual gun tube but not the weapon system. The title gunner is applied to the member of the team charged with operating, aiming, and firing a gun.
Autocannon are automatic guns designed primarily to fire shells and are mounted on a vehicle or other mount.
Machine guns are similar, but usually designed to fire simple projectiles. In some calibers and some usages, these two definitions overlap.
A related military use of the word is in describing
gun-type fission weapon. In this instance, the "gun" is part of a
nuclear weapon and contains an explosively propelled sub-critical slug of
fissile material within a barrel to be fired into a second sub-critical mass in order to initiate the fission reaction. Potentially confused with this usage are small nuclear devices capable of being fired by artillery or
recoilless rifle.In civilian use, a related item used in agriculture is a
captive bolt gun. Such captive piston guns are often used to humanely stun farm animals for slaughter.
Shotguns are normally civilian weapons used primarily for hunting. These weapons are typically smooth bored and fire a shell containing small lead or steel balls. Variations use rifled barrels or fire other projectiles including solid lead slugs, a
Taser XREP projectile capable of stunning a target, or other payloads. In military versions, these weapons are often used to burst door hinges or locks in addition to antipersonnel uses.1
Types of guns
thumb|250px|Colt Python .357 Magnum revolver
Military firearms
Machine guns
Handguns
Autocannon
Artillery guns
Tank guns
Hunting guns
Guns for training and entertainment
See also
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Citations and notes
MR.B
