What is it Gun ?!

A gun is a weapon used by firing bullets or kinetic arrows, either by means of explosive propellants (such as gunpowder) or by mechanical means (such as air pressure or a string).

The concept of small arms usually describes small guns that can be carried by one person. There are also large guns such as cannons and mortars.

Rockets and missiles are not firearms, since they are driven by force and are not repulsed from a barrel : Although they may be launched from a launcher, it does not fire them but merely targets them at their initial acceleration.

A gun is a tubular ranged weapon typically designed to pneumatically discharge projectile that are solid (most guns) but can also be liquid (as in water guns/cannons and projected water disruptors) or even charged particles (as in a plasma gun) and may be free-flying (as with bullets and artillery shells) or tethered

(as with Taser guns, spearguns and harpoon guns).

The means of projectile propulsion vary according to designs, but are traditionally effected by a high gas pressure contained within a shooting tube (gun barrel), produced either through the rapid combustion of propellants (as with firearms), or by mechanical compression (as with air guns). The high-pressure gas is introduced behind the projectile, accelerating it down the length of the tube, imparting sufficient launch velocity to sustain its further travel towards the target once the propelling gas ceases acting upon it at the end of the tube. Alternatively, acceleration via electromagnetic field generation may be employed, in which case the shooting tube may be substituted by guide rails (as in railguns) or wrapped with magnetic coils (as in coilguns).

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