Gun safety

Gun safety rules and practice recommendations are intended to avoid or, or the consequences of s.  Their purpose is to eliminate or minimize the risks of unintentional death, injury or property damage caused by improper possession, storage or handling of firearms. There were 47,000 unintentional firearm deaths worldwide in 2013.

Rules and mindset
Gun safety training seeks to instill a certain mindset and appropriate habits by following specific rules. The mindset is that firearms are inherently dangerous and must always be stored carefully and handled with care. Handlers are taught to treat firearms with respect for their destructive capabilities, and strongly discouraged from playing or toying with firearms, a common cause of accidents. The rules of gun safety follow from this mindset.

In 1902, the English politician and shooting enthusiast  wrote some much-quoted verses on gun safety, including many salient points. His verses "A Father's Advice" begin with the following:

"If a sportsman true you'd be Listen carefully to me: Never, never, let your gun Pointed be at anyone..."

Ira L. Revees, in his 1913 book The A B C of Rifle, Revolver and Pistol Shooting, stated the following:
 * "The Accident-Proof Rule":
 * "The muzzle of a firearm should never point in a direction in which, if discharged, it would do injury where injury is not meant to be done."


 * "the companion rule of the one just given":
 * "All firearms are at all times loaded."


 * And he went on to say:
 * "The trigger should never be pulled until the identity of the thing fired at has been established beyond any doubt."

Various version of the "Ten Commandments of Gun Safety" have been published. This one is from the : "# Treat every gun with the respect due a loaded gun.
 * 1) Carry only empty guns, taken down or with the action open, into your car, camp and home.
 * 2) Always be sure that the barrel and action are clear of obstructions.
 * 3) Always carry your gun so that you can control the direction of the muzzle.
 * 4) Be sure of your target before you pull the trigger.
 * 5) Never point a gun at anything you do not want to shoot.
 * 6) Never leave your gun unattended unless you unload it first.
 * 7) Never climb a tree or a fence with a loaded gun.
 * 8) Never shoot at a flat, hard surface or the surface of water.
 * 9) Do not mix gunpowder and alcohol."

, an influential figure in modern firearms training, formalized and popularized "Four Rules" of safe firearm handling. Prior lists of gun safety rules included as few as three basic safety rules or as many as ten rules including gun safety and sporting etiquette rules. In addition to Cooper, other influential teachers of gun safety include, Clint Smith, Chuck Taylor, Jim Crews, Bob Munden and.

Jeff Cooper's Four Rules: "# All guns are always loaded.
 * 1) Never let the muzzle cover anything you are not willing to destroy.
 * 2) Keep your finger off the trigger until your sights are on the target.
 * 3) Be sure of your target and what is beyond it."

The National Rifle Association provides a similar set of rules: "# ALWAYS keep the gun pointed in a safe direction.
 * 1) ALWAYS keep your finger off the trigger until ready to shoot.
 * 2) ALWAYS keep the gun unloaded until ready to use."

provides similar rules for their rifle marksmanship clinics: "# Always keep the muzzle in a safe direction.
 * 1) Do not load until given the load command.
 * 2) Keep your finger off the trigger until the sights are on the target.
 * 3) Make sure those around you follow the safety rules."

The uses the concept of The Four Firearm ACTS: "# Assume every firearm is loaded.
 * 1) Control the muzzle direction at all times.
 * 2) Trigger finger off trigger and out of trigger guard.
 * 3) See that the firearm is unloaded."

The United States Marine Corps uses the following four weapons safety rules:

"# Treat every weapon as if it were loaded
 * 1) Never point the weapon at anything you do not intend to shoot
 * 2) Keep your finger straight and off the trigger until you're ready to fire
 * 3) Keep the weapon on safe until you intend to fire"

Blank ammunition, which is a primed casing filled with gunpowder, either crimped or covered with a wad, is dangerous up to 15 feet. In the past, people have injured or killed themselves believing that blanks were not dangerous. Therefore, gun safety rules apply even to guns loaded with blanks.

Treat firearms as if they are loaded
This rule is a matter of keeping a vigilant mindset. The purpose is to create safe handling habits, and to discourage presumptive reasoning along the lines of, "I know my gun is unloaded so certain unsafe practices are OK". The proposition "the gun is always loaded" means that, even though it may be known that this is not true of a particular firearm, that knowledge is never trusted or relied upon until definitively proven. Thus even if the firearm turned out to be loaded when the handler thought it was not, treating it as loaded would avoid an "unintentional discharge", and if one should occur anyway, avoiding damage, injury or death.

Many firearm accidents result from the handler mistakenly believing a firearm is emptied, safetied, or otherwise disarmed when in fact it is ready to be discharged. Such misunderstandings can arise from a number of sources.
 * Faulty handling of the firearm. A handler may execute the steps of procedures such as loading, firing and emptying in the wrong order or omit steps of the procedures.
 * Misunderstandings about a firearm's status. For instance, a handler may think the safety is on when it is not. A round of ammunition may be left in the  or in the magazine while the handler thinks it is emptied.  The firearm may have been handled by another individual without the handler's knowledge.  A handler may receive a firearm and assume it is in a certain state without checking whether that assumption is true.  For example, as handlers interact and pass the firearm between them, each avoids over-relying on the "show clear" of the other. Person 1 may misjudge the status; person 2 cannot assume that "it's OK because person 1 already checked it".
 * Mechanical failures. Wear, faulty assembly, damage or faulty design of the firearm can cause it not to function as intended. For instance, a safety may have been worn down to a point where it is no longer functioning. Broken or worn parts in the trigger, sear or hammer/striker may have given the firearm a "hair trigger" (a very sensitive trigger). A dented or bent body of the firearm may cause jams or premature discharge of ammunition. Sensitivity to impact may cause a firearm to discharge if dropped or struck against another object.

If a handler always treats firearms as capable of being discharged at any time, the handler is more likely to take precautions to prevent an unintentional discharge and to avoid damage or injury if one does occur.

Point the muzzle away from non-targets
Also known as muzzle discipline, this rule is intended to minimize the potential damage caused by an unintended discharge. While the first rule teaches that a firearm must be assumed to be ready to fire, this second rule goes beyond that and says, "Since the firearm might fire, assume that it will and make sure no harm occurs when it does."

A consequence of this rule is that any kind of playing or "toying" with firearms is prohibited. Playfully pointing firearms at people or other non-targets violates this rule and is possibly an extreme endangerment to life and/or property. To discourage this kind of behavior, the rule is sometimes alternately stated, "Never point a firearm at anything unless you intend to destroy it."

Two natural "safe" directions to point the muzzle are up (at the sky) and down (at the ground). Both have their advantages and disadvantages. Firing at the ground may result in a or cause hazardous fragments to be flung at people or objects. Aiming upward eliminates this risk but replaces it with the risk that the bullet may cause damage when it comes down to the ground again. A bullet fired straight up only returns at the of the bullet. However, a bullet fired at an angle not perfectly vertical will retain its spin and ballistic stability on the way down and can attain much more lethal speeds. Several accidents have reportedly been caused by discharging firearms into the air; although the evidence in a few such cases has been disputed, a study by the found 43 likely cases of injury from falling bullets during 2004  celebrations in. It is also possible that the muzzle will inadvertently be pointed at a non-target such as someone's head or an aircraft.

In cases where the firearm is being handled indoors, up and down may not be safe directions. For example, a bullet fired upward or downward may travel through the ceiling, floor and plenum between adjacent floors of a multi-story building. In indoor areas where firearms will be handled often, a suitably safe direction should be designated. Firing ranges often designate a direction in which it is safe to point a firearm; almost universally this is downrange into a backstop which is designed to contain bullets and eliminate potential ricochets. In armories or other areas where weapons must be handled, a container filled with sand known as a "clearing barrel" or "clearing can" is often used for this purpose; bullets unintentionally discharged into the barrel will be safely stopped and contained by the sand.

Keep fingers off the trigger
Also known as trigger discipline, this rule is intended to prevent an undesired discharge. Normally a firearm is discharged by depressing its trigger. A handler's finger may involuntarily move for any of several reasons: the handler is startled, a lack of full attention on body movements, physiological reasons beyond conscious control such as a spasm, stumbling or falling, or the finger being pushed by something (as when trying to holster a handgun with one's finger on the trigger). Handlers are therefore taught to minimize the harmful effects of such a motion by keeping their finger off and far away from the trigger until the muzzle is pointing at the target and the handler wishes to discharge the firearm.

The and the  area above the trigger of a firearm presents a natural point for a handler to keep their finger out straight alongside the weapon, so as not to violate this rule. Another recommendation is to keep the trigger finger above the trigger guard, so that there is less chance of the finger involuntarily slipping into the guard when startled. A properly indexed trigger finger also helps remind the person holding the firearm of the direction of the muzzle.

In, such as and , this rule is often violated, even by characters who should be trained in gun safety such as  or.

Be sure of the target and of what is beyond it
This rule is intended to eliminate or minimize to non-targets when a firearm is intentionally discharged. Unintended damage may occur if a non-target is misidentified as a target, if the target is missed, or if the bullet hits something or someone other than the intended target.

Handlers are taught that they must positively identify and verify their target. Additionally, they learn that even when firing at a valid target, unintended targets may still be hit, for three reasons:


 * The bullet may miss the intended target and hit a non-target around or beyond the target.
 * A non-target may pass in front of the target and be hit with a bullet aimed at the target.
 * The bullet may pass through the intended target and hit a non-target beyond it, so-called "overpenetration".

Therefore, this rule requires a handler to "always be sure of your target; not just the target itself, but above, below, to the left, to the right, in front of, and behind the target".

This may create situations that present dilemmas for a handler. Such situations are for instance a police officer in a riot with bystanders, a civilian facing a possible intruder at night, or a soldier in a confrontation where civilians are near the enemy. Indecision or misjudgment of the handler's abilities in such a situation may cause undesired outcomes, such as injury to the handler due to hesitation, or the handler violating and causing unintended damage.

Hunters are commonly prohibited from shooting across roads and trails, or after dusk and before dawn, due to the risk of inadvertently hitting an unintended target. All discharge of firearms is prohibited in some cities, in part due to the possibility of hitting unseen targets.

Training is used to minimize the risk of such outcomes. Target practice increases the precision with which the handler can discharge the firearm and thus increase the chances that the intended target is hit. Education about gives the handler knowledge about the characteristics of a bullet after a target is hit. This knowledge coupled with insight into the handler's own capabilities makes it easier for the handler to make appropriate decisions about whether to discharge or not, even if given little time and/or put under severe stress.

Ammunition can be chosen to reduce the risk of overpenetration; see, , and.

Range safety rules
Ranges and organized shoots may impose additional safety rules on participants. For example, at its marksmanship clinics, Project Appleseed requires that a range safety officer (RSO) uses a weed trimmer line to check each rifle's bore for obstructions prior to its first use for the day. Six steps are then always followed when a round of shooting is complete and the line is ready to go "cold" to allow posting or checking targets, or when a rifle is ready to be removed from the line: 1) magazine out; 2) bolt back; 3) safety on; 4) chamber flag in; 5) ground the rifle; 6) step back; no one touching the rifle.

Open bolt indicators, or chamber flags, such as the yellow safety flag distributed by the or the green chamber flag distributed by Project Appleseed may be required to be inserted in the chamber to show the chamber is empty.

Ranges may limit the type of ammunition used, such as prohibiting the use of incendiary, tracer, or armor-piercing rounds, or more powerful rounds than a range is equipped to handle. They may require the use of ear and eye protection. Alcohol is commonly forbidden. Some ranges impose a waiting period for shooters who wish to rent a firearm, or require them to bring a friend, in order to reduce the incidence of suicides. Ranges are advised to designate a range safety officer to enforce these rules.

Ranges must be designed with safety in mind, including the use of proper backstops for the intended type of shooting.

Malfunctions
Firearm malfunctions may be caused by the primer and/or powder, by mechanical failures, or by mishandling.

Failure to fire malfunctions
Malfunctions associated with the firing pin of a firearm, or with the primer and/or powder within a cartridge include failures to discharge (misfires, "duds"), delayed discharge (hang-fires), and incomplete or insufficient discharge (squibs). A misfire is when the cartridge does not fire after it is struck by the firing pin. A hangfire is when the firing pin strikes the cartridge, but there is a delay of some seconds before the cartridge finally fires. A squib is when an underpowered round is fired, perhaps with an insufficient amount of powder in the case, and the bullet lodges in the bore. If the firearm is fired again, the barrel can peel back, severely damaging the weapon and injuring the shooter.

In each case, the shooter should wait for a period of time, commonly recommended between 25 seconds, up to two minutes, with the firearm pointed in a safe direction, then carefully remove the magazine, extract any mis-fed or misfired cartridge(s), and, with the breech opened carefully, check to ensure there is not a bullet or other obstruction lodged in the bore of the barrel. If there is an obstruction, and a subsequent round is fired, the firearm can fail explosively resulting in serious injury. Misfired rounds should be disposed of properly, usually in a special container for live ammo that failed to fire after ejecting round; such rounds should not be simply disposed of in the trash.

Mechanical malfunctions
Mechanical malfunctions of firearms include s, jams, accidental release of the firing pin, and failure of the breech or barrel to contain the propellant.

A slam fire is when a cartridge fires immediately upon being chambered, before a trigger squeeze, and is most often caused by a floating firing pin that becomes obstructed by debris, or by an improperly raised primer that is installed on a cartridge case. A slam fire can also be caused by a softer primer being used than normally recommended.

Types of jams include failures to feed, extract, or eject a cartridge; failure to fully cycle after firing; and failure of a recoil- or gas-operated firearm to lock back when empty (largely a procedural hazard, as a "slide lock" is a visual cue that the firearm's ammunition supply is empty). When a jam occurs, the handler should exercise extreme caution as a cartridge whose primer has been struck and which has been deformed in a jam can discharge unexpectedly (in a "hang-fire".) One method of quickly clearing a jammed semi-automatic weapon is.

Firearms may also fire unintentionally for several reasons, including dropping the weapon or when a firearm receives any hard mechanical shocks. Similarly, unintentional firing may occur due to faulty triggers, or excessive heat buildup in the chamber which leads to the propellant. To prevent accidental firing when firearms are dropped or jarred, experts often suggest using modern firearm designs that have safety features such as a transfer bar or a which prevent the firing pin from striking the primer unless the trigger is squeezed. For older firearms without these features, experts suggest that they should be carried without a round in the chamber, or with the firing pin resting on an empty chamber in the case of revolvers.

Firearms may undergo (a "kaBoom" or "kB") due to various causes, some caused by mishandling and others by poor design, weakened parts or the use of ammunition for which the firearm was not designed, but which will chamber and fire nonetheless. Barrels may become blocked by foreign material, such as dirt, snow, or even water. For that reason, the muzzle should never be allowed to rest on the ground or allowed to accumulate precipitation. Another form of mishandling is the use of a cartridge that generates more pressure than the firearm was designed for. This can occur through faulty, or the use of (+P or +P+) or magnum loads in firearms not rated for them.

Storage
Proper storage prevents unauthorized use or theft of firearms and ammunition, or damage to them.

Gun safes
A '' or 'gun cabinet' is commonly used to physically prevent access to a firearm. Local laws may require particular standards for the lock, for the strength and burglar resistance of the cabinet, and may even require guns and ammunition to be stored separately.

Disassembly
Access to a functioning firearm can be prevented by keeping the firearm disassembled and the parts stored at separate locations. Sometimes, this rule is codified in law. For example, Swedish law requires owners of firearms either to store the entire firearm in a safe or lockable gun rack, or to lock the "vital piece" (bolt, etc.) away in a safe place.

Locks
There are several types of locks that serve to make it difficult to discharge a firearm. Locks are considered less effective than keeping firearms stored in a lockable safe since locks are more easily defeated than approved safes. An unauthorized handler can bypass the locked firearm at their leisure. Some manufacturers, such as, build locks into the firearm itself.

California effected regulations in 2000 that forced gun locks to be approved by a firearm safety device laboratory via California Penal Code Section 12088. All gun locks under this code must receive extensive tests including saw, pick, pull, and many other tests in order to be approved for the state of California. If a lock passes the requirements then it is said to be (CADOJ) approved.


 * Trigger locks
 * Trigger locks prevent trigger manipulation, however they do not guarantee that the firearm absolutely cannot be discharged (see ). Some trigger locks are integrated into the design of the weapon, requiring no external parts besides the key.  Generally, two pieces come together from either side behind the  and are locked in place, which can be unlocked with a  or . This physically prevents the trigger from being depressed to discharge the weapon.  Other more commercially common types of trigger locks do not go behind the trigger, but encompass the full area within the  to making the trigger inaccessible to users.   is a gun attachment that completely covers and prevents access to the trigger, which makes it different from other trigger locks.


 * There is controversy surrounding manufacturing standards, usage, and legislation of trigger locks. While supporters of trigger locks argue that they will save children from dying in gun accidents, critics point to demonstrations that some models can be removed by children with very little force and common household tools. Many firearms can go off if the gun is dropped. It is important to make sure to look for firearms that fully disengage the hammer when the safety is put on. A former senior product manager at Master Lock, a trigger lock manufacturer, was quoted as saying "If you put a trigger lock on any loaded gun, you are making the gun more dangerous." Critics also point out that a trigger lock will increase the time it takes a gun owner to respond to a self-defense emergency. In 2008, the U.S. Supreme Court  that required handguns to be locked or otherwise kept inoperative within the home, saying that this "makes it impossible for citizens to use them for the core lawful purpose of self-defense."


 * Although there are no universal standards for the design or testing of trigger locks, some jurisdictions, such as the state of, maintain a list of approved trigger lock devices. In , a trigger lock is one of the methods prescribed by law to secure a firearm during transport or storage.


 * Chamber locks
 * Chamber locks aim to block ammunition from being chambered, since most firearms typically cannot be discharged unless the ammunition is in the correct position. They are used to prevent live ammunition from being loaded into a firearm by blocking the chamber with a or a chamber plug, which is sometimes wedged into place with the use of a tool, in essence jamming the gun.  Another type is one in which a steel rod locked into the safety cartridge with a key.  As long as the rod and safety cartridge are engaged, the  cannot eject nor can live ammunition be loaded into the firearm.  Chamber locks work with most firearm types including s, s,  and s.  They are available in any  and length, and may include such features as unique keying, rapid removal, and rigorous testing and certification by major state departments such as the.


 * Some s require the handler to insert a temporary chamber plug which often has a brightly colored external tag, to signal the chamber being devoid of ammunition and blocked, whenever the gun is being unused. These are called empty chamber indicators, or simply chamber flags.


 * Cable locks
 * Cable locks are a popular type of lock that usually threads into the through the ejection port of repeating firearms.  These locks physically obstruct the movements of the, thereby preventing the cycling of the , and deny the return to "battery" and the closure of the breech.  In many designs of pistol and rifle, they also thread through the magazine well of the gun to prevent the proper insertion of a magazine.


 * s
 * Personalized guns, or smart guns, are intended to prevent unauthorized use with built-in locks that are released by RFID chips or other proximity devices,, magnetic rings, or a.

Ammunition storage
Some experts recommend storing ammunition in secure locations away from firearms. Ammunition should be kept in cool, dry conditions free from contaminating vapors to prevent deterioration of the propellant and cartridge. Handloaders must take special precautions for storing primers and loose gunpowder.

Secondary dangers
While a firearm's primary danger lies in the discharge of ammunition, there are other ways a firearm may be detrimental to the health of the handler and bystanders.

Noise
When a firearm is discharged it emits a very loud noise, typically close to the handler's ears. This can cause temporary or permanent hearing damage such as. Hearing protection such as earplugs (disposable or reusable) and/or earmuffs (including electronic devices that amplify quiet sounds) can be used to reduce the risk of hearing damage. Firearms may also be fitted with a sound which cools the gas emitting from the barrel to make the volume safer for the handler's ears.

Hot gases and debris
A firearm emits hot gases, powder, and other debris when discharged. Some weapons, such as and  firearms, typically eject spent cartridge casings at high speed. Casings are also dangerously hot when ejected. Revolvers store spent casings in the chamber, but may emit a stream of hot gases and possible fine particulate debris laterally from the interface between the revolving chamber and the gun barrel. Any of these may hurt the handler or bystanders through burning or impact damage. Because eyes are particularly vulnerable to this type of damage, eye protection should be worn to reduce the risk of injury. Prescription lenses and various tints to suit different light conditions are available. Some eye protection products are rated to withstand impact from birdshot loads, which offers protection against irresponsible firearms use by other game bird shooters.

Toxins and pollutants
In recent years the toxic effects of ammunition and firearm cleaning agents have been highlighted.


 * Lead ammunition left in nature may become mobilized by.
 * Older ammunition may have -based primers.
 * Lead accumulates in shooting range backstops.

Indoor ranges require good ventilation to remove pollutants such as powder, smoke, and lead dust from the air around the shooters. Indoor and outdoor ranges typically require extensive decontamination when they are decommissioned to remove all traces of lead, copper, and powder residues from the area.

Lead, copper and other metals will also be released when a firearm is cleaned. Highly aggressive solvents and other agents used to remove lead and powder fouling may also present a hazard to health. Installing good ventilation, washing hands after handling firearms, and cleaning the space where the firearm was handled lessens the risk of unnecessary exposure.

Impaired users
Firearms should never be handled by persons who are under the influence of or any s which may affect their judgment. Gun safety teachers advocate zero tolerance of their use. In the United States, this recommendation is codified in many states' penal codes as a crime of "carrying under the influence", with penalties similar to /. Other sources of temporary impairment include exhaustion, dehydration, and emotional stress. These can affect reaction time, cognitive processing, sensory perception, and judgment.

Many jurisdictions prohibit the possession of firearms by people deemed generally incapable of using them safely, such as the mentally ill or convicted felons.

Children
Children who are generally considered too young to be allowed to handle firearms at all can be taught a different set of rules:


 * Stop.
 * Don't touch.
 * Leave the area.
 * Tell an adult.

The purpose of these rules is to prevent children from inadvertently handling firearms. These rules are part of the program developed by the  for preschoolers through 6th graders.

Whether programs like Eddie Eagle are effective has not been conclusively determined. Some studies published in peer-reviewed journals have shown that it is very difficult for young children to control their curiosity even when they have been taught not to touch firearms. Gun access is also a major risk factor for youth suicide. The American Academy of Pediatrics (AAP) advises that keeping a gun in the home, especially a handgun increases the risk of injury and death for children and youth in the home. If families do keep a gun in the home, the AAP advises keeping it unloaded and locked up, with the ammunition locked in a separate location, and the keys to the locked boxes hidden.

Polling shows that over half of parents who do not own a gun have never talked with their children age 5–17 about gun safety. The ASK Campaign (Asking Saves Kids) is based on the fact that many families with children have a gun, and almost half these guns are left unlocked or loaded. The ASK Campaign urges parents to ask their friends, neighbors and family members if they have an unlocked gun in the home before sending their children over to play.

Older youth (age may vary per program, such as 12–18 year olds) may take part in a program for safe rifle handling, such as the ones promoted by these organizations:



Movie clips of firearm accidents

 * DEA agent accidentally discharges a weapon and wounds himself during gun safety demonstration
 * Finger on trigger while tripping results in two accidental discharges
 * Accidental discharge while showing off a handgun