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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 U.S. Air Force's GUU5/P. At one time, land-based artillery tubes were called cannon and sea-based naval cannon were called guns. The term "gun" evolved 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 gun, nail gun, glue gun, grease gun. 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 rifling 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.

Tags: 英國大砲區分方式.

Comments and ratings for Guns
  • (62 stars)

    by Andrew Saura on 17/04/2014

    Because its exiting

  • (62 stars)

    by Kendall Tisinger on 31/03/2014

    You can't turn it sideways and there is no animation. And the worst part is is that it sets the sound as your ringtone when your dont want it to!

  • (62 stars)

    by Marcus Avery on 29/03/2014

    When thers a adimadic gun it shoots like ashot gin

  • (62 stars)

    by Tania Capdevila on 19/03/2014

    Ta for

  • (62 stars)

    by Jemima Lake on 14/03/2014

    Rapid fire

  • (62 stars)

    by Skip Mi on 04/03/2014

    Its just all the guns from MW3, I like how you copy and paste your description from wikipedia and slap it here. and it seems only dumb indians like these shitty apps ah well most of these nigger muslims are as smart as a roach Also why is all the guns

  • (62 stars)

    by Mehar Hanan on 23/02/2014