Firearm (tool)
Encyclopedia
A firearm can be used primarily as a tool
Tool
A tool is a device that can be used to produce an item or achieve a task, but that is not consumed in the process. Informally the word is also used to describe a procedure or process with a specific purpose. Tools that are used in particular fields or activities may have different designations such...

, instead of as a weapon
Firearm
A firearm is a weapon that launches one, or many, projectile at high velocity through confined burning of a propellant. This subsonic burning process is technically known as deflagration, as opposed to supersonic combustion known as a detonation. In older firearms, the propellant was typically...

, to project either single or multiple objects at high velocity through a controlled explosion. The firing is achieved by the gas
Gas
Gas is one of the three classical states of matter . Near absolute zero, a substance exists as a solid. As heat is added to this substance it melts into a liquid at its melting point , boils into a gas at its boiling point, and if heated high enough would enter a plasma state in which the electrons...

es produced through rapid, confined burning
Combustion
Combustion or burning is the sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat and conversion of chemical species. The release of heat can result in the production of light in the form of either glowing or a flame...

 of a propellant
Propellant
A propellant is a material that produces pressurized gas that:* can be directed through a nozzle, thereby producing thrust ;...

. This process of rapid burning is technically known as deflagration
Deflagration
Deflagration is a term describing subsonic combustion that usually propagates through thermal conductivity; hot burning material heats the next layer of cold material and ignites it. Most "fire" found in daily life, from flames to explosions, is deflagration...

. In older firearms, this propellant was typically black powder, but modern firearms use smokeless powder
Smokeless powder
Smokeless powder is the name given to a number of propellants used in firearms and artillery which produce negligible smoke when fired, unlike the older gunpowder which they replaced...

, cordite
Cordite
Cordite is a family of smokeless propellants developed and produced in the United Kingdom from 1889 to replace gunpowder as a military propellant. Like gunpowder, cordite is classified as a low explosive because of its slow burning rates and consequently low brisance...

, or other propellants. Many firearms such as mortars do not have rifled
Rifling
Rifling is the process of making helical grooves in the barrel of a gun or firearm, which imparts a spin to a projectile around its long axis...

 bores to impart spin to the projectile for improved flight stability, such as is seen with firearms used as weapons, although some are rifled. The lack of rifling can prevent tangling of grappling hook lines, buoy lines, and such, although some firearms intended for use at the longest ranges in these applications are rifled.

Background

In the Middle Ages the term "firearm" was used in English to denote the arm in which the match was held that was used to light the touch hole
Touch hole
A touch hole is a small hole, through which the propellant charge of a cannon or muzzleloading gun is ignited. In small arms, the flash from a charge of priming held in the flash pan is enough to ignite the charge within...

 on the hand cannon. The term was a variation on the contemporary terms of bow arm and drawing arm still used in archery
Archery
Archery is the art, practice, or skill of propelling arrows with the use of a bow, from Latin arcus. Archery has historically been used for hunting and combat; in modern times, however, its main use is that of a recreational activity...

. Due to the effects of firing the ordnance (barrel) at the time, the gunner had to be located somewhat behind the weapon, steadying brace with the other hand, hence the name "hand gun" became synonymous with the "fire arm". The first firearms used as tools were weapons placed into alternative service, such as Manby mortars.

Until the mid-19th century, projectiles and propellant (black powder) were generally separate components used in a muzzle-loading firearm such as a rifle, pistol, or cannon. Sometimes for convenience a suitable amount of powder and a bullet were wrapped in a paper package, known as a cartridge. This evolved into the form of a tubular metal casing enclosing a primary igniter (primer) and the powder charge, with the projectile payload press-fit into the end of the casing opposite the primer. Cartridges were widely adopted, and as of World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 it had become the primary form of loading. Mortars use a similar concept of encapsulation; however the projectile and casing are generally a single piece that is launched from the firearm, with rope lines attached to the single piece.

A problem for firearms is the accumulation of waste products from the partial combustion of propellants, and small flecks of the cartridge case, known as fouling or gunshot residue. These waste products can interfere with the internal functions of the firearm. As a result, regularly used firearms must be periodically partially disassembled, cleaned and lubricated to ensure the firearm’s reliability.

History

The earliest depiction of a firearm is a sculpture from a cave in Sichuan dating to the 12th century of a figure carrying a vase-shaped bombard
Bombard
Bombard may refer to:*The act of carrying out a bombardment*Bombard , a type of late medieval siege weapon.*Bombard , a contemporary double reed instrument used to play traditional Breton music....

 with flames and a cannonball coming out of it. The oldest surviving gun, made of bronze, has been dated to 1288 because it was discovered at a site in modern-day Acheng District where the Yuan Shi records that battles were fought at that time.

The Europeans, Arabs, and Koreans all obtained firearms in the 14th century. The Turks, Iranians, and Indians all got firearms no later than the 15th century, in each case directly or indirectly from the Europeans. The Japanese did not acquire firearms until the 16th century, and then from the Portuguese rather than the Chinese.

Mortars

The Manby Mortar
Manby Mortar
The Manby Mortar was invented by Captain George William Manby, also the inventor of the portable fire extinguisher.The mortar fired a shot with a line attached from the shore to the wrecked ship...

 was invented by Captain George William Manby
George William Manby
Captain George William Manby FRS , was an English author and inventor. He designed an apparatus for saving life from shipwrecks and also the first modern form of fire extinguisher.-Life:Manby went to school at Downham Market...

, also the inventor of the portable fire extinguisher. On 18 February 1807, Manby looked on helplessly as a Naval ship, the Snipe, ran aground 60 yards off Great Yarmouth during a storm. By some accounts, a total of 214 people drowned, including French prisoners of war, women and children. Following this tragedy, Manby experimented with mortars, and so invented the Manby Mortar, later developed into the breeches buoy
Breeches buoy
A breeches buoy is a crude rope-based rescue device used to extract people from wrecked vessels, or to transfer people from one location to another in situations of danger. The device resembles a round emergency personal flotation device with a leg harness attached...

, which fired a thin rope from shore into the rigging of a ship in distress. A strong rope, attached to the thin one, could then be pulled aboard the ship. His successful invention followed an experiment as a youth in 1783, when he shot a mortar carrying a line over Downham church. His invention was officially adopted in 1814, and a series of mortar stations were established around the coast. The Manby Mortar was used by the Waterguard
Waterguard
The Waterguard was the name given to a division of HM Customs and Excise responsible for the collection of customs and excise revenue from the passengers and crew of ships and aircraft, and other incoming travellers to the United Kingdom...

 and later by H M Coastguard
Her Majesty's Coastguard
Her Majesty's Coastguard is the service of the government of the United Kingdom concerned with co-ordinating air-sea rescue.HM Coastguard is a section of the Maritime and Coastguard Agency responsible for the initiation and co-ordination of all civilian maritime Search and Rescue within the UK...

 for many years. The first recorded rescue using the Manby mortar was on 18 February 1808; Manby himself was in charge of the mortar and a crew of seven were brought to safety from the Plymouth
Plymouth
Plymouth is a city and unitary authority area on the coast of Devon, England, about south-west of London. It is built between the mouths of the rivers Plym to the east and Tamar to the west, where they join Plymouth Sound...

 Brig
Brig
A brig is a sailing vessel with two square-rigged masts. During the Age of Sail, brigs were seen as fast and manoeuvrable and were used as both naval warships and merchant vessels. They were especially popular in the 18th and early 19th centuries...

 Elizabeth stranded off the shore at Great Yarmouth
Great Yarmouth
Great Yarmouth, often known to locals as Yarmouth, is a coastal town in Norfolk, England. It is at the mouth of the River Yare, east of Norwich.It has been a seaside resort since 1760, and is the gateway from the Norfolk Broads to the sea...

.

Cannons

A Lyle gun
Lyle gun
Line-throwing guns are most often referred to as Lyle Guns, after their inventor David A. Lyle. They were used from the late 19th century to 1952, when they were replaced by rockets for throwing lines.-History:...

 was used to shoot a line towards people in distress in order to rescue them and save their lives. The Lyle Gun was toted to the shoreline usually by Surfmen that manned the L.S.S using the tool. The iron wheels that supported the cart had wide bands on the outside the wheel to keep it from sinking into the soft sand especially when it came to being used on the beaches of Cape Cod and other stations along the east coast of North America. The projectile that carried the line to the craft in distress was fired over the ship to ensure its target. The line fired to the ship in distress was one of several designed to support the breeches buoy which would carry survivors back to shore on a line that would take them over the waves.

The Lyle gun could shoot a projectile about 300 yards.

Examples of later firearms based upon the Lyle gun are widely seen in maritime museum displays, such as at the Sleeping Bear Point Coast Guard Station Maritime Museum in Glen Haven, Michigan
Glen Haven, Michigan
Glenn Haven is a restored logging village on the shore of Lake Michigan on the Leelanau Peninsula within the Sleeping Bear Dunes National Lakeshore. Attractions include the restored General Store and Blacksmith Shop. The unincorporated community is located in Glen Arbor Township.Also located in...

. The exhibits there focus on the U.S. Life-Saving Service, the U.S. Coast Guard, and Great Lakes
Great Lakes
The Great Lakes are a collection of freshwater lakes located in northeastern North America, on the Canada – United States border. Consisting of Lakes Superior, Michigan, Huron, Erie, and Ontario, they form the largest group of freshwater lakes on Earth by total surface, coming in second by volume...

 shipping history. In the summer, demonstrations are given of rescue drills and equipment used to fire a rescue line from shore more than 400 yards (365.8 m) to a ship in "distress".

Rifles

Rifles are also commonly used to launch grappling hooks for various purposes. For example, grappling hooks are currently used by combat engineers breaching tactical obstacles. A grappling hook
Grappling hook
A grappling hook is an anchor with multiple hooks , attached to a rope; it is thrown, dropped, sunk, projected, or fastened directly by hand to where at least one hook may catch and hold. Generally, grappling hooks are used to temporarily secure one end of a rope. They may also be used to dredge...

 is launched over the open ground in front of the obstacle and dragged backwards in an attempt to detonate trip-wire-fused land mines, and can be hooked onto wire obstacles and pulled to set off any booby trap
Booby trap
A booby trap is a device designed to harm or surprise a person, unknowingly triggered by the presence or actions of the victim. As the word trap implies, they often have some form of bait designed to lure the victim towards it. However, in other cases the device is placed on busy roads or is...

s on the wire. A tool available for this purpose is the rifle-launched grapnel, a single-use grappling hook placed on the end of an M4
M4 Carbine
The M4 carbine is a family of firearms tracing its lineage back to earlier carbine versions of the M16, all based on the original AR-15 designed by Eugene Stoner and made by ArmaLite. It is a shorter and lighter variant of the M16A2 assault rifle, with 80% parts commonality.It is a gas-operated,...

/M16 rifle
M16 rifle
The M16 is the United States military designation for the AR-15 rifle adapted for both semi-automatic and full-automatic fire. Colt purchased the rights to the AR-15 from ArmaLite, and currently uses that designation only for semi-automatic versions of the rifle. The M16 fires the 5.56×45mm NATO...

. A grapnel can clear up to 99 percent of the trip-wires in a single pass.

Grappling hooks were originally used in naval warfare
Naval warfare
Naval warfare is combat in and on seas, oceans, or any other major bodies of water such as large lakes and wide rivers.-History:Mankind has fought battles on the sea for more than 3,000 years. Land warfare would seem, initially, to be irrelevant and entirely removed from warfare on the open ocean,...

 to catch the rigging
Rigging
Rigging is the apparatus through which the force of the wind is used to propel sailboats and sailing ships forward. This includes masts, yards, sails, and cordage.-Terms and classifications:...

 of an enemy ship so that it could be drawn in and boarded. Later, grappling hooks were also used in rescue work or to assist in scaling walls. The most common design consists of a central shaft with a hole at the base of the shaft, called an "eye" to attach the rope, and three equally spaced hooks at the end of the shaft, so arranged that at least one is likely to catch on some protuberance of the target. Older designs were almost always firearms, either mortars or cannons, for special use with Lyle guns or similar tools. Some modern designs feature folding hooks to resist unwanted attachment. Modern grappling hooks used in rescue work are propelled by firearms, compressed air
Compressed air
Compressed air is air which is kept under a certain pressure, usually greater than that of the atmosphere. In Europe, 10 percent of all electricity used by industry is used to produce compressed air, amounting to 80 terawatt hours consumption per year....

, or rocket
Rocket
A rocket is a missile, spacecraft, aircraft or other vehicle which obtains thrust from a rocket engine. In all rockets, the exhaust is formed entirely from propellants carried within the rocket before use. Rocket engines work by action and reaction...

s.

Shotguns

Industrial shotguns have long been used for specialized applications in servicing lime kilns, blast furnaces, and even for making seismic shots. Typically of 8 gauge
8 bore
Eight bore, 8 bore, or 8 gauge is an obsolete caliber used commonly in the 19th century black powder firearms. It may refer to either rifles or shotguns. It is the size between the larger four bore and the smaller ten bore...

, industrial shotguns are much larger than shotguns designed for use as weapons and are designed for firing using fixed mount stations, not being intended for firing from the shoulder. They are used for removing lime deposits from inside kilns and for removing slag deposits from inside blast furnaces, both being used during routine maintenance. When used for generating seismic shots, they provide very repetitive and consistent peak amplitude levels. Industrial shotguns have also been used in lesser sizes (most commonly 10 and 12 gauge) for use in bird control around airports. Both blanks and slugs are used in industrial shotguns, depending on the exact effect desired, blanks most commonly being used for bird control.

Flare guns and survival guns

Firearms used as weapons are also often considered "tools of last resort". Intended for use in survival situations, often with dual-use capability in some cases to launch signal flares and to defend against large predators such as bears, the primary aim of such firearms is not killing, per se, but survival and rescue. Dedicated flare guns also exist that fire flares
Flare (pyrotechnic)
A flare, also sometimes called a fusee, is a type of pyrotechnic that produces a brilliant light or intense heat without an explosion. Flares are used for signalling, illumination, or defensive countermeasures in civilian and military applications...

. They are typically used as a distress signal as well as other signaling purposes at sea and between aircraft and people on the ground. The majority of flare guns are 12 gauge, but they should not ever be loaded with live ammunition. The amount of pressure generated by a typical 12 gauge shotgun shell (11,500 psi according to SAAMI) far exceeds the pressure most flare guns can control. Firing shotgun shells from a modern plastic flare gun can have deadly results for the user and should not be done.

The most common type of flare gun is a Very pistol (which can also be spelled Verey pistol), which was named after Edward Wilson Very
Edward Wilson Very
Edward Wilson Very was an American naval officer who developed and popularized a single-shot breech-loading snub-nosed flare gun that fired flares that bear his name .Records indicate that Edward W...

 (1847–1910), an American naval officer who developed and popularized a single-shot breech-loading snub-nosed pistol that fired flare
Flare (pyrotechnic)
A flare, also sometimes called a fusee, is a type of pyrotechnic that produces a brilliant light or intense heat without an explosion. Flares are used for signalling, illumination, or defensive countermeasures in civilian and military applications...

s. Modern varieties are frequently made out of brightly-colored, durable plastic
Plastic
A plastic material is any of a wide range of synthetic or semi-synthetic organic solids used in the manufacture of industrial products. Plastics are typically polymers of high molecular mass, and may contain other substances to improve performance and/or reduce production costs...

.

The older type of Very pistol, typical of the type used in the Second World War
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, are of one inch bore. Newer models fire smaller 12-gauge
Gauge (bore diameter)
The gauge of a firearm is a unit of measurement used to express the diameter of the barrel. Gauge is determined from the weight of a solid sphere of lead that will fit the bore of the firearm, and is expressed as the multiplicative inverse of the sphere's weight as a fraction of a pound . Thus...

 flares. In countries where possession of firearms is strictly controlled, such as the United Kingdom
Gun politics in the United Kingdom
Gun politics in the United Kingdom generally places its main considerations on how best to ensure public safety and how deaths involving firearms can most effectively be prevented. The United Kingdom has one of the lowest rates of gun homicides in the world, and did so even before strict gun...

, the use of Very pistols as emergency equipment on boats is less common than, for example, the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

.

Flare guns may be used whenever someone needs to send a distress signal
Distress signal
A distress signal is an internationally recognized means for obtaining help. Distress signals take the form of or are commonly made by using radio signals, displaying a visually detected item or illumination, or making an audible sound, from a distance....

. The flares must be shot directly above, making the signal visible for a longer period of time and revealing the position of whoever is in need of help.

While not intended as a weapon, they can and have been used as one in some situations. In 1942, at Pembrey Airfield
Pembrey Airport
-Former operators:Other airlines that have operated at Pembrey:*Air Wales*Air Independence*Air Winton...

 in Wales, a German pilot mistakenly landed at the field. The duty pilot, Sgt. Jeffreys, did not have a conventional weapon; he grabbed a Very pistol and used that to capture the German pilot, Oberleutnant
Oberleutnant
Oberleutnant is a junior officer rank in the militaries of Germany, Switzerland and Austria. In the German Army, it dates from the early 19th century. Translated as "Senior Lieutenant", the rank is typically bestowed upon commissioned officers after five to six years of active duty...

 Arnim Faber.

Specially-designed survival guns have also been manufactured for use as survival tools, such as the Armalite AR-7
AR-7
The ArmaLite AR-7 Explorer, designed by M-16 inventor Eugene Stoner, is a semi-automatic .22 Long Rifle rifle developed from the AR-5 adopted by the U.S. Air Force as a pilot and aircrew survival weapon. Its intended markets today are backpackers and other recreational users as a take-down utility...

 survival rifle. The prototype of what would become the AR-7 was designed by Eugene Stoner at ArmaLite Inc., a division of Fairchild Aircraft. The rifle shares some of the features of the bolt-action
Bolt-action
Bolt action is a type of firearm action in which the weapon's bolt is operated manually by the opening and closing of the breech with a small handle, most commonly placed on the right-hand side of the weapon...

 AR-5
AR-5
The AR-5 was the basis of the MA-1 aircrew survival rifle, adopted by the USAF in 1956, as a replacement for the M6 Aircrew Survival Weapon. The M6 is a superposed combination weapon with a .22 Hornet rifle barrel over a .410 shotgun barrel...

, another rifle designed by Stoner for ArmaLite and adopted by the United States Air Force
United States Air Force
The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

 in 1956 as the MA-1. The MA-1 was intended to replace the M6 Aircrew Survival Weapon
M6 Aircrew Survival Weapon
The M6 Air Crew Survival Weapon was a specially made firearm issued to the United States Air Force aircraft crews to help forage for food in the event of a plane crash....

 which was a superimposed ("over-under") twin-barrel rifle/shotgun in chambered in .22 Hornet
.22 Hornet
The .22 Hornet is a low-end vermin, small-game and predator centerfire rifle cartridge. It is considerably more powerful than the .22 WMR and the .17 HMR, achieving higher velocity with a bullet twice the weight. The Hornet also differs very significantly from these in that it is not a rimfire...

 and .410 bore
.410 bore
.410 bore, commonly misnamed the .410 gauge, is the smallest gauge of shotgun shell commonly available. It has similar base dimensions to the .45 Colt revolver cartridge, though the .410 is significantly longer, up to , allowing many single-shot firearms and some revolvers chambered in that...

, using a break-open action. The AR-5 had the advantage of rapid fire, using the same .22 Hornet cartridge used in the M4 Survival Rifle
M4 Survival Rifle
The M4 Survival Rifle was developed during World War II as part of the survival gear stored under the seat of military aircraft, to give downed aircrew a survival weapon for foraging wild game for food.- History :...

 as well as the M6. The AR-7 was a completely different design, using a blowback semi-automatic action in .22 Long Rifle
.22 Long Rifle
The .22 Long Rifle rimfire cartridge is a long established variety of ammunition, and in terms of units sold is still by far the most common in the world today. The cartridge is often referred to simply as .22 LR and various rifles, pistols, revolvers, and even some smoothbore shotguns have...

. Like the bolt-action AR-5, the AR-7 was designed as a survival rifle for shooting small game. The rifle can be disassembled into its component parts (barrel, receiver, magazine, and stock), which can be stored in the stock. The AR-7 was constructed primarily of aluminum, with plastic for the stock and buttcap. The AR-7 measures 35 inches overall when assembled. It disassembles to four sections (barrel
Gun barrel
A gun barrel is the tube, usually metal, through which a controlled explosion or rapid expansion of gases are released in order to propel a projectile out of the end at a high velocity....

, action
Firearm action
In firearms terminology, an action is the physical mechanism that manipulates cartridges and/or seals the breech. The term is also used to describe the method in which cartridges are loaded, locked, and extracted from the mechanism. Actions are generally categorized by the type of mechanism used...

, stock
Stock (firearm)
A stock, also known as a buttstock or shoulder stock, is a part of a rifle or other firearm, to which the barrel and firing mechanism are attached, that is held against one's shoulder when firing the gun. Stocks are also found on crossbows though a crossbow stock is more properly referred to as a...

, and magazine), with everything stowing inside the ABS stock. Fishing hooks and line are also commonly stowed inside the ABS stock. The AR-7 measures 16 inches long when configured for storage. The rifle weighs 2.5 pounds
Pound (mass)
The pound or pound-mass is a unit of mass used in the Imperial, United States customary and other systems of measurement...

 so this is even light enough to take along backpacking. It floats in water
Water
Water is a chemical substance with the chemical formula H2O. A water molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state . Water also exists in a...

, as did the previous AR-5/MA-1 design. The rear sight
Iron sight
Iron sights are a system of shaped alignment markers used as a sighting device to assist in the aiming of a device such as a firearm, crossbow, or telescope, and exclude the use of optics as in telescopic sights or reflector sights...

 is a peep sight, which comes on a flat metal blade with two different size apertures. It is adjustable for elevation (up-down). The front sight is adjustable for windage (side-side). Accuracy is sufficient for hunting small game in survival situations, for obtaining food at ranges up to 50 yard
Yard
A yard is a unit of length in several different systems including English units, Imperial units and United States customary units. It is equal to 3 feet or 36 inches...

s.

Direct fastening systems

Cartridge based concrete anchoring and steel anchoring systems have been devised for firearms used as tools, such as developed by Hilti
Hilti
Hilti Corporation, Hilti Aktiengesellschaft or Hilti AG also known as Hilti Group develops, manufactures, and markets products for the construction and building maintenance industries, primarily to the professional end-user...

 and Ramset with their so-called powder-actuated tools. Typical calibers range from .22 cal up to 9 mm for the cartridges, which propel anchors and nails into concrete, steel, and other materials. Developed in World War II to temporarily repair ship damage quickly in the case of hull
Hull (watercraft)
A hull is the watertight body of a ship or boat. Above the hull is the superstructure and/or deckhouse, where present. The line where the hull meets the water surface is called the waterline.The structure of the hull varies depending on the vessel type...

 breach, this technology is today commonly used in construction and manufacturing to join materials to hard substrates such as steel and concrete.

In Australia and the Netherlands, these tools are classed as firearm
Firearm
A firearm is a weapon that launches one, or many, projectile at high velocity through confined burning of a propellant. This subsonic burning process is technically known as deflagration, as opposed to supersonic combustion known as a detonation. In older firearms, the propellant was typically...

s, since they fire a projectile with potentially lethal force. As such, their ownership and use is regulated in Australia and the Netherlands. The owner has to register the tool, and an operator of one of these tools is required to have a license and to have undergone training in their use. These laws are in keeping with Australia's and the Netherlands' strict firearm laws
Gun politics in Australia
Gun politics have only become a notable issue in Australia since the 1980s. Low levels of violent crime through much of the 20th century kept levels of public concern about firearms low...

.

From 1958 onwards, the so-called "direct-acting" tools have been quickly replaced by "indirect-acting" tools. In the former type, the combustion gases from a blank powder cartridge directly drive the fastener into the base material. The nail can reach velocities of hundreds of meters per second making it a highly dangerous projectile.

In modern indirect-acting tools, the combustion gas drives a piston inside the tool "barrel" which in turn "hammers" the nail into the material. The piston cannot leave the tool barrel as it is retained by a stop-ring or piston brake. Of the total energy contained in the ensemble of moving piston and nail, ~95% is contained in the piston. Due to a piston mass of ~100...150 g, piston and fastener reach much less than the limit velocity of 100 m/s limited by official approval.

Modern PATs include multiple safety devices: The tool must be pressed to the work surface with >50 N force before it can be triggered. The trigger must be pulled only after full compression or the tool will not work (no "bump-firing" allowed). The tool must pass drop tests in all directions to prove that it will not fire even if dropped on the muzzle or knocked against a hard surface.

European legislation

With the coming into effect of the EC Machinery Directive (2006/42/EC), powder actuated tools are distinguished from weapons and are now considered "impact machinery", provided they are "designed for industrial or technical purposes only". After the testing and approval defined by the Machinery Directive for tools of this type, PAT must carry the CE mark from July, 2011 at the latest (but can since January, 2010). This means that for bringing them to the European market, the manufacturer no longer needs a firearms-type approval from a respective authority but a CE approval from a European accredited test laboratory ("notified body"). Firearms legislation no longer applies to PAT.

A European safety standard (EN 15895) is under development and is expected to be effective at the end of 2010 or beginning of 2011.

See also

General firearm (tool) topics
  • Antique guns
    Antique guns
    An antique firearm is, loosely speaking, a firearm designed and manufactured prior to the beginning of the 20th century. The Boer War is often used as a cut-off event, although the exact definition of what constitutes an "antique firearm" varies from jurisdiction to jurisdiction...

  • Breeches buoy
    Breeches buoy
    A breeches buoy is a crude rope-based rescue device used to extract people from wrecked vessels, or to transfer people from one location to another in situations of danger. The device resembles a round emergency personal flotation device with a leg harness attached...

  • Niagara Scow
    Niagara Scow
    The Niagara Scow is the unofficial name of the wreck of a small scow that brought two men perilously close to plunging over the Horseshoe Falls, the largest of the Niagara Falls...

  • Powder-actuated tool


Gun technology and science
  • Ballistics
    Ballistics
    Ballistics is the science of mechanics that deals with the flight, behavior, and effects of projectiles, especially bullets, gravity bombs, rockets, or the like; the science or art of designing and accelerating projectiles so as to achieve a desired performance.A ballistic body is a body which is...

  • Cartridge
    Cartridge (firearms)
    A cartridge, also called a round, packages the bullet, gunpowder and primer into a single metallic case precisely made to fit the firing chamber of a firearm. The primer is a small charge of impact-sensitive chemical that may be located at the center of the case head or at its rim . Electrically...

  • Physics of firearms
    Physics of firearms
    From the viewpoint of physics , a firearm, as for most weapons, is a system for delivering maximum destructive energy to the target with minimum delivery of energy on the shooter. The momentum delivered to the target however cannot be any more than that on the shooter...

  • Terminal ballistics
    Terminal ballistics
    Terminal ballistics, a sub-field of ballistics, is the study of the behavior of a projectile when it hits its target. It is often referred to as stopping power when dealing with human or other living targets. Terminal ballistics is relevant both for small caliber projectiles as well as for large...



Gun-related terminology
  • Gauge (bore diameter)
    Gauge (bore diameter)
    The gauge of a firearm is a unit of measurement used to express the diameter of the barrel. Gauge is determined from the weight of a solid sphere of lead that will fit the bore of the firearm, and is expressed as the multiplicative inverse of the sphere's weight as a fraction of a pound . Thus...

  • Shotgun shell
    Shotgun shell
    A shotgun shell is a self-contained cartridge loaded with lead shot or shotgun slug designed to be fired from a shotgun....



Types of firearms

External links

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