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The first firearms originated in 10th-century China, when bamboo tubes containing gunpowder and pellet projectiles were mounted on spears to make the portable fire lance,[4] operable by a single person, which was later used effectively as a shock weapon in the siege of De'an in 1132. In the 13th century, fire lance barrels were replaced with metal tubes and transformed into the metal-barreled hand cannon.[5] The technology gradually spread throughout Eurasia during the 14th century. Older firearms typically used black powder as a propellant, but modern firearms use smokeless powder or other propellants. Most modern firearms (with the notable exception of smoothbore shotguns) have rifled barrels to impart spin to the projectile for improved flight stability.
Modern firearms can be described by their caliber (i.e. bore diameter). For pistols and rifles this is given in millimeters or inches (e.g. 7.62mm or .308 in.), or in the case of shotguns by their gauge (e.g. 12 ga. and 20 ga.). They are also described by the type of action employed (e.g. muzzleloader, breechloader, lever, bolt, pump, revolver, semi-automatic, fully automatic, etc.), together with the usual means of deportment (i.e. hand-held or mechanical mounting). Further classification may make reference to the type of barrel used (i.e. rifled) and to the barrel length (e.g. 24 inches), to the firing mechanism (e.g. matchlock, wheellock, flintlock, or percussion lock), to the design's primary intended use (e.g. hunting rifle), or to the commonly accepted name for a particular variation (e.g. Gatling gun).
Shooters aim firearms at their targets with hand-eye coordination, using either iron sights or optical sights. The accurate range of pistols generally does not exceed 100 metres (110 yd; 330 ft), while most rifles are accurate to 500 metres (550 yd; 1,600 ft) using iron sights, or to longer ranges whilst using optical sights. (Firearm rounds may be dangerous or lethal well beyond their accurate range; the minimum distance for safety is much greater than the specified range for accuracy). Purpose-built sniper rifles and anti-materiel rifles are accurate to ranges of more than 2,000 metres (2,200 yd).
In the military, firearms are categorized into heavy and light weapons regarding their portability by infantry. Light firearms are those that can be readily carried by individual foot soldier, though they might still require more than one individual (crew-served) to achieve optimal operational capacity. Heavy firearms are those that are too large and heavy to be transported on foot, or too unstable against recoil, and thus require the support of a weapons platform (e.g. a fixed mount, wheeled carriage, vehicle, aircraft or water vessel) to be tactically mobile or useful.
The subset of light firearms that only use kinetic projectiles and are compact enough to be operated to full capacity by a single infantryman (individual-served) are also referred to as small arms. Such firearms include handguns such as pistols, revolvers, and derringers; and long guns such as rifles (and their subtypes), shotguns, submachine guns, and machine guns.[6]
As of 2018[update] the Small Arms Survey reported that there were over one billion firearms distributed globally, of which 857 million (about 85 percent) were in civilian hands.[7][8] U.S. civilians alone account for 393 million (about 46 percent) of the worldwide total of civilian-held firearms.[8] This amounts to "120.5 firearms for every 100 residents".[8] The world's armed forces control about 133 million (about 13 percent) of the global total of small arms, of which over 43 percent belong to two countries: the Russian Federation (30.3 million) and China (27.5 million).[7] Law enforcement agencies control about 23 million (about 2 percent) of the global total of small arms.[7]
A handgun is, as defined generally and in many gun laws, a firearm that can be used with a single hand.[9][10][11][12] They are the smallest of all firearms, and are common as sidearms, concealed carry weapons, or as backup weapons for self-defense.
A long gun is any firearm with a notably long barrel, typically a length of 10 to 30 inches (250 to 760 mm) (there are restrictions on minimum barrel length in many jurisdictions; maximum barrel length is usually a matter of practicality). Unlike a handgun, long guns are designed to be held and fired with both hands, while braced against either the hip or the shoulder for better stability. The receiver and trigger group is mounted into a stock made of wood, plastic, metal, or composite material, which has sections that form a foregrip, rear grip, and optionally (but typically) a shoulder mount called the butt. Early long arms, from the Renaissance up to the mid-19th century, were generally smoothbore firearms that fired one or more ball shot, called muskets or arquebus depending on caliber and firing mechanism. Since the 19th and 20th centuries, various types of long guns have been created for different purposes.
The small size of a carbine provides lower weight and better maneuverability, making it ideal for close-quarters combat and storage in compact areas. This makes them popular firearms among special forces and police tactical units alongside submachine guns. They are also popular with (and were originally mostly intended for) military personnel in roles that are expected to engage in combat, but where a full-size rifle would be an impediment to the primary duties of that soldier (logistical personnel, airborne forces, military engineers, officers, etc.), though since the late 20th century these have been superseded to a degree in some roles by personal defense weapons. Carbines are also common among civilian firearm owners who have size, space, and power concerns similar to military and police users.
Though automatic rifles are sometimes considered to be their own category, they are also occasionally considered to be other types of firearms that postdated their invention, commonly as light machine guns. Automatic rifles are sometimes confused with machine guns or vice versa, or are defined as such by law; for example, the National Firearms Act and Firearm Owners Protection Act define a "machine gun" in United States Code Title 26, Subtitle E, Chapter 53, Subchapter B, Part 1, 5845 as "... any firearm which shoots ... automatically more than one shot, without manual reloading, by a single function of the trigger". "Machine gun" is therefore largely synonymous with "automatic weapon" in American civilian parlance, covering all automatic firearms. In most jurisdictions, automatic rifles, as well as automatic firearms in general, are prohibited from civilian purchase or are at least heavily restricted; in the U.S. for instance, most automatic rifles are Title II weapons that require certain licenses and are greatly regulated.
Personal defense weapons were developed to provide rear and "second-line" personnel not otherwise armed with high-caliber firearms (vehicle and weapon crews, engineers, logistical personnel, etc.) with a method of effective self-defense against skirmishers and infiltrators who cannot effectively be defeated by low-powered submachine guns and handguns, often the only firearms suitable for those personnel (while they could be issued rifles or carbines, those would become unnecessary burdens in their normal duties, during which the likelihood of hostility is fairly rare regardless, making their issuance questionable). Thus, per their name, personal defense weapons allow these personnel to effectively defend themselves from enemies and repel attacks themselves or at least until support can arrive. They are not intended for civilian self-defense due to their nature as automatic firearms (which are usually prohibited from civilian purchase), though some semi-automatic PDWs exist for the civilian market, albeit often with longer barrels.
Manual action or manual operation is essentially any type of firearm action that is loaded, and usually also fired, one cartridge at a time by the user, rather than automatically. Manual action firearms can be divided into two basic categories: single-shot firearms that can only be fired once per barrel before it must be reloaded or charged via an external mechanism or series of steps; and repeating firearms that can be fired multiple times per barrel, but can only be fired once with each subsequent pull of the trigger or ignite, and the firearm's action must be reloaded or charged via an internal mechanism between trigger pulls.
Semi-automatic, self-loading, or autoloading is a firearm action that, after a single discharge, automatically performs the feeding and ignition procedures necessary to prepare the firearm for a subsequent discharge. Semi-automatic firearms only discharge once with each trigger actuation, and the trigger must be actuated again to fire another cartridge.
Automatic is a firearm action that uses the same automated action cycling as semi-automatic, but continues to do so for as long as the trigger is actuated, until the trigger is let go of or the firearm is depleted of available ammunition. The excess energy released from a discharged cartridge is used to load a new cartridge into the chamber, then igniting the propellant and discharging said new cartridge by delivering a hammer or striker impact on the primer. Automatic firearms are further defined by the type of cycling principles used, such as recoil operation (uses energy from the recoil to cycle the action), blowback (uses energy from the cartridge case as it is pushed by expanding gas), blow forward (use propellant gas pressure to open the breech), or gas operation (uses high-pressure gas from a fired cartridge to dispose of the spent case and load a new cartridge).
Selective fire or select fire is the capability of a firearm to have its fire mode adjusted between semi-automatic, burst, or automatic. The modes are chosen by means of a fire mode selector, which varies depending on the weapon's design. The presence of selective-fire modes on firearms allows more efficient use of ammunition for specific tactical needs, either precision-aimed or suppressive fire. Selective fire is most commonly found on assault rifles and submachine guns.
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