SIG Pro semi-automatic pistol
A projectile being fired from an artillery piece
Battleship USS Iowa fires a full broadside from its nine sixteen-inch naval guns
Projectile and cartridge case for the huge World War II Schwerer Gustav artillery piece. Most projectile weapons use the compression or expansion of gases as their motive force.
A 'flying-cloud thunderclap-eruptor,' a proto-gun firing thunderclap bombs, from the Huolongjing.
Ball speeds of 105 mph have been recorded in baseball.
The first firearm (a "proto-gun"), the fire lance, from the Huolongjing.
Hand cannon from the Chinese Yuan Dynasty (1271–1368)
Western European handgun, 1380
A breech loading matchlock with a plug bayonet from the Binglu, 1606.
Depiction of a musketeer (1608)
The Henry rifle and Winchester rifle
Gatling gun
Rifling of a 105 mm Royal Ordnance L7 tank gun.
The Heckler & Koch MP5 submachine gun is widely used by law enforcement tactical teams and military forces.

A gun is a ranged weapon designed to use a shooting tube (gun barrel) to launch projectiles.

- Gun

Blowguns and pneumatic rifles use compressed gases, while most other guns and cannons utilize expanding gases liberated by sudden chemical reactions by propellants like smokeless powder.

- Projectile
SIG Pro semi-automatic pistol

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Bronze cannon with inscription dated the 3rd year of the Zhiyuan era (1332) of the Yuan Dynasty (1271–1368); it was discovered at the Yunju Temple of Fangshan District, Beijing in 1935.

Cannon

Bronze cannon with inscription dated the 3rd year of the Zhiyuan era (1332) of the Yuan Dynasty (1271–1368); it was discovered at the Yunju Temple of Fangshan District, Beijing in 1935.
A bronze "thousand ball thunder cannon" from the Huolongjing.
Earliest picture of a European cannon, "De Nobilitatibus Sapientii Et Prudentiis Regum", Walter de Milemete, 1326
Western European handgun, 1380
The first Western image of a battle with cannon: the Siege of Orléans in 1429
Cannon from the 15th century at Šibenik city walls
The Dardanelles Gun, a 1464 Ottoman bombard
Malik E Maidan, a 16th-century cannon, was effectively used by the Deccan sultanates, and was the largest cannon operated during the Battle of Talikota.
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A cannon found from the Brantas river. Made of bronze, with a triangular embossed touch hole. The wooden parts were recently made for display.
Various 16th-century artillery pieces, including culverin, falconet and mortar
36-pounder long gun at the ready
Illustration by William Simpson shows action in a British artillery battery during the Crimean War with cannon firing and being loaded and men bringing in supplies.
A 3-inch Parrott rifle from the Battle of Chancellorsville
Armstrong gun deployed by Japan during the Boshin war (1868–69).
The 1870s de Bange 90 mm cannon on the yard of Eastern Finland military office in Mikkeli, South Savonia, Finland
Comparison of 1888 and 1913 German cannon
Royal Artillery howitzers at the Battle of the Somme
USS Iowa (BB-61) firing her 16 in guns
A large bore Maxim on USS Vixen (PY-4) c. 1898
Side elevation of a typical 18th-century cannon
The parts of a cannon described in John Roberts' The Compleat Cannoniere, London, 1652
Firing of a 6-pound cannon
The Tsar Cannon, the largest howitzer ever made, cast by Andrey Chokhov<ref>{{cite book|title=Guinness Rekordbok|year=1996|isbn=978-91-37-10723-3|page=204|language=sv|author=översättning och bearbetning: Folke Günther ... |publisher=Forum|location=Stockholm}}</ref>
Remains of a post-medieval cannon battery, mounted on a medieval town wall, although without carriages.
Contemporary illustration on how a cannon could be used with the aid of quadrants for improved precision.
The use of gabions with cannon was an important part in the attack and defence of fortifications.
Fort Bourtange, a bastion fort, was built with angles and sloped walls specifically to defend against cannon.
Westland C.O.W. Gun Fighter with 37mm C.O.W. gun mounted to fire upwards
Supermarine Spitfire with 20 mm cannon protruding from the leading edge of the wing
GSh-23 autocannon mounted on the underside of a Mikoyan-Gurevich MiG-23
The GAU-8/A Avenger rotary cannon, mounted in a Fairchild A-10 Thunderbolt II

A cannon is a large-caliber gun classified as a type of artillery, and usually launches a projectile using explosive chemical propellant.

The word has been used to refer to a gun since 1326 in Italy, and 1418 in England.

A collection of spring-piston air rifles

Air gun

A collection of spring-piston air rifles
Break-barrel air rifles
Kunitomo air gun developed by the Japanese inventor Kunitomo Ikkansai,
Kunitomo air gun trigger mechanism
Variety of different types & models of spring piston & gas ram air guns
An example of a Benelli Kite pre-charged pneumatic air pistol, as used in 10 metre air pistol ISSF shooting events
Airforce Condor, one of the most powerful PCP air rifles on the market
CO2 pistol and disposable Powerlet cylinders
A Pure Energy N2 tank with a remote line attached
Walther CP 88 CO2 pistol with adapted silencer
Crossman 2240 CO2 one shot pistol, (.22 pellet caliber)
Wadcutter or Flathead pellets
A .177 (4.5mm) caliber "Wadcutter" pellet next to a stick of chewing gum
Steel BBs coated with copper and nickel
Darts for an air gun

An air gun or airgun is a gun that fires projectiles pneumatically with compressed air or other gases that are mechanically pressurized without involving any chemical reactions, in contrast to a firearm, which pressurizes gases chemically via oxidation of combustible propellants that generates propulsive energy by breaking molecular bonds.

A projectile being fired from an artillery piece

Muzzle velocity

A projectile being fired from an artillery piece

Muzzle velocity is the speed of a projectile (bullet, pellet, slug, ball/shots or shell) with respect to the muzzle at the moment it leaves the end of a gun's barrel (i.e. the muzzle).