PALADIN ARMORY

Manufacturer of Custom Firearms and Suppressors

P.O. Box 225   Elliston,  MT  59728

Phone 406-492-4570

e-mail: paladin@paladinarmory.com

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MACHINE GUNS

The firearms illustrated below are examples of some of the machine guns we have manufactured or rebuilt for customers.  Because the BATF places machine guns in different categories of ownership,  our selection changes constantly.  Note, before purchasing a machine gun, make certain it is in a category you can own in your state (For more information see LEGAL TIPS).  Check this page periodically for updates.  Please drop us a line for current offerings or click CLOSE-OUTS and look at our "class 3" list. 
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Chinese AKM in 5.56 x45 converted to "KRINKOV" configuration

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AK-74 5.45x39 Assault Rifle converted from Romanian semiauto

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Reactivated Browning 1919A4 with new side plate and 7.62 NATO conversion kit

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PPS 43 WWII Russian Submachine Gun in 7.62 x 25, rebuilt from parts kit

 

 

 

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Reactivated .45 ACP Thompson Model 1928 Submachine gun, AKA "Tommy Gun"

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M-11/9 COBRAY 9mm Submachine Gun fitted with HK MP-5 sights

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M-4 Carbine, .223mm, select fire, built on registered M-16 receiver

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M-169

M-169 suppressed 9mm upper kit shown mounted on select fire M-16 lower receiver with optical sight (not included)

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SUITE-16  conversion options are almost endless as evidenced by these M-4 SOCOM posters

TERMINOLOGY & DEFINITIONS

Machine Gun Automatic Rifle Submachine Gun Automatic
Heavy Machine Gun Machine Rifle Machine Pistol Semiautomatic
Medium Machine Gun Battle Rifle Carbine Automatic Cannon
Light Machine Gun Assault Rifle Machine Carbine Gatling Gun
General Purpose Machine Gun Assault Weapon Assault Carbine Mini-Gun

 

Machine Gun (MG) - A firearm designed to discharge more than one cartridge with each pull of the trigger or operating mechanism is a machine gun. The Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATFE) also considers the following firearms to be  machine guns: any firearm that can be "readily converted" into a machine gun; any malfunctioning firearm in need of repair which discharges more than one cartridge when the the firing mechanism is activated.   Because their method of operation already places them in the NFA classification, the configuration of the stock, barrel, bayonet lug, and flash hider is not restricted.  If a suppressor is permanently attached to the machine gun, it too is considered a part of the gun and not subject to a separate tax.   Machine guns range in size from small .22 caliber pistols such as the Mexican Trajoe up to the .50 caliber Browning M-2 heavy machine gun.  Automatic weapons firing projectiles larger than .50 inches in diameter, including the Oerlikon 20 mm cannon and Bofors 40 mm cannon, are generally described as destructive devices rather than machine guns, because their ammunition normally contains an explosive charge.  The electrically operated G.E. mini-gun is classified as a machine gun, although the mechanically operated Gatling gun is not.  The Federal Transfer tax on a machine gun is $200.  Because machine guns come in all shapes and sizes, various names have been conjured up to describe them.  The list below is composed of the most common terms you likely will encounter.  Technically, they are all machine guns. 
 

Machine Rifle - An archaic term for automatic rifle.

 

Assault Weapon - The term "assault weapon" should not be confused with assault rifle.  "Assault weapon" is a recent term popularized by the news media and codified by Congress in the 1994 Crime Bill (Brady Bill).  The Brady Bill prohibits civilian ownership of certain rifles, pistols, and shotguns built after the enactment of the 1994 law.  Assault weapons are defined by 1994 law (now lapsed) as any new (post-94) semiautomatic firearm capable of accepting a detachable magazine and having more than one of the following additional features: separate pistol grip, folding or collapsible shoulder stock, bayonet lug, grenade launcher, flash hider, or threaded barrel capable of accepting a flash hider or grenade launcher.  Assault weapons are not machine guns and are not registered for purposes of transfer or ownership.  In legal parlance, a weapon is anything used in an offensive or defensive manor.  Therefore, some pundits prefer to use the term automatic weapon, automatic firearm, automatic pistol, automatic shotgun, etc., when describing self-loading firearms that have not been used in combat or self-defense.  This term often is misused to describe both semiautomatic and full automatic pistols, rifles, shotguns, machine guns, and cannon.

 

Machine Carbine -  This term is is common parlance in Britain and Europe, but is rarely used in America.  Depending upon the particular firearm being described, it can loosely refer to a submachine gun, carbine, or assault rifles.

 

Automatic - Depending upon the time period involved, this term can have different meanings.  When the first self-loading firearms were invented in the 1880s, they often were referred to as automatics, regardless of how many shots were discharged with each pull of the trigger or activation of the firing mechanism.  Technically speaking, any firearm capable of discharging more than one shot with each pull of the trigger is a true automatic, and this is how the term is used legally today in the United States.  This includes everything from the tiny .22 caliber Trajoe machine pistol to the 40mm Bofors anti-aircraft gun.   Also included in this definition are firearms containing burst fire mechanisms that allow a regulated number of shots (usually two or three) with each pull of the trigger.

 

Semiautomatic - This is the correct and legal term to describe the action of any self-loading firearm that discharges a single shot with each pull of the trigger or activation of the firing mechanism.  Some news media erroneously use the term semiautomatic machine gun.   Such a term is a contradiction because the legal definition of a machine gun violates the principle of one shot per each pull of the trigger.      

 

Heavy Machine Gun (HMG) - Originally, any machine gun designed for heavy sustained firing from a tripod and utilizing a water jacket cooling system around the barrel to dissipate heat, hence the term "heavy".  Examples include the Maxim, Vickers, and Browning 1917A1.  Later this term applied to machine guns that fired bullets larger than those used in the issue service rifles.  The most popular example is the Browning .50 caliber M-2 series. 
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The original heavy machine gun was water-cooled and so designated because of its combined weight with tripod and water condenser canister of about 80 pounds.  This one is a Vickers built adaptation of the first self loading machine gun, the Maxim. 

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The Browning M-2 "Ma Deuce" .50 caliber heavy machine gun is still in service in the U.S.military and other militaries of the world

 

Medium Machine Gun (MMG) - At first this was a lighter variant of the early heavy machine guns.  The barrel jacket water cooling system was dispensed with and a heavier barrel substituted.  This gave the weapon greater portability but reduced sustained-fire capability.  One of the best examples is the Browning 1919A4.  By the advent of W.W.II, many water-cooled machine guns such as the earlier Browning 1917 and 1917A1 were reclassified as medium machine guns.   
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The Browning 1919A4 saw heavy action in WWII, Korea, and Vietnam.  Normally mounted on a light tripod or pintle mounted on a truck or jeep, it also served in tanks, small boats, and aircraft. 

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John Browning poses with his 30-06 caliber 1917 water cooled machine gun, a much less complicated gun than the Maxim and Vickers.  Originally classified as a heavy machine gun, it was redesignated a medium machine gun during WWII to avoid confusion with the more powerful M-2 .50 caliber machine gun.

 

General Purpose Machine Gun (GPMG) - A German invention between the World Wars, its purpose was to provide a very flexible gun that could serve as light, medium, and even heavy gun by adding or subtracting features such as tripods, bipods, shoulder stocks, sights, ammo carriers, and barrels.  The real secret of the concept was the quick-change barrel system that allowed a hot barrel to be replaced in seconds, thus maintaining a heavy stream of fire.  Another feature of all modern GPMGs was borrowed from the Germans - heavy use of stampings, spotwelding, and simple cast or machined parts.  Examples include the German MG-42, Belgian FN MAG 58, and American M-60.   

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The finely machined but temperamental MG34 was the first practical general purpose machine gun to see wide military use.  It could be mounted on a tripod for fixed, defensive operations, or used with a bipod for offensive, maneuvering operations.  It was often mounted on vehicles.  

 

 

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The mass produced MG42 made excessive use of stampings and spot welding to speed production.  It proved to be a more robust and reliable gun than the MG34 and became the mainstay weapon of the standard German WWII infantry unit.   It remains in use today as the MG3, albeit in caliber 7.62 NATO.  During WWII the US Army reverse engineered captured specimens to produce an American version in 30-06, though after testing it was decided not to put it into production.  Features of the gun eventually were incorporated into America's first GPMG, the postwar M60. 

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The FN MAG 58 has seen wide and popular acceptance across the free world, and remains the mainstay weapon of most NATO countries. 

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The M60 was adopted by the US Army in time to play a key role in the Vietnam war.  Despite a long development period, it was plagued with problems which only recently have been effectively addressed.  Despite its yeoman service, it earned the unflattering moniker of "The Pig".  It has largely been superseded by the M240, itself a variant of the FN MAG 58.

 

Light Machine Gun (LMG) - A lighter weight, purpose-built machine gun, usually of original design and not converted from a heavier weapon, that fires a rifle cartridge either from a belt or large magazine.  Most LMGs have shoulder stocks and folding bipods.  Some have been adapted for tripod use such as the excellent British BREN gun.  The current trend in LMGs favors assault rifle ammunition.

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Though no longer standard issue in the major militaries of the world, the BREN (left and center) has a well deserved reputation for reliability and dependability that no LMG has exceeded.  It was derived from the excellent Czech ZB-26, which itself would be used against them by German forces in WWII and Chinese forces in the Korean War.  The name BREN is a compilation of BR for Brno, Czechoslovakia, (where the design originated) and EN for Enfield, England, where it was built under license.  The MK1 (left) was chambered in .303 British and uses a heavily curved magazine to offset the problems encountered when loading rimmed cartridges.  BRENs saw great service in WWII, Korea, and the colonial wars that followed.  During the Korean War British forces had the dubious honor of encountering, capturing, and using Chinese BRENs chambered in .303 British and 7.92 Mauser.  The former were UK guns previously captured by the Japanese and later by the Chinese, while the latter were Canadian built contract guns made for the Nationalist Chinese forces before the Communists seized power.  Many post-war Common Wealth guns were converted to the shorter and more reliably feeding 7.62 NATO and redesignated L4 (center).  These guns used a straighter magazine and slotted flash hider. 

 

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Another LMG of WWII vintage was the Johnson 1941 (above).  The Johnson LMG was a modification of their Model 1941 rifle which was rushed into use by the Marine Corps early in WWII.  Attempts to standardize the Johnson rifle and LMG in USMC service were scrapped (over virgorous protests from Marines who were actively using them) once adequate supplies of M-1 Garands and BARs could be sourced from the Army, thus greatly simplifying logistics.  Though developed separately, it possesses a layout strikingly similar to the German FG42 battle rifle described below.  Also like the FG42, it fired in the full automatic mode with the bolt open and locked to the rear to aid cooling and to prevent an overheated chamber from igniting a round (referred to as "cook off"), and in the semiautomatic mode from a closed bolt position to improve accuracy.  Unlike the FG42, the Johnson was recoil operated, wherein the barrel reciprocates to unlock the action during firing.    The US Army acquired 125 "Johnny Guns" (Johnson LMGs) to equip the First Special Service Force (a joint American Canadian airborne and mountain warfare commando raiding force), which used them in the Aleutian Campaign where they did not encounter Japanese opposition, and in Italy where they were successfully deployed against the Germans.  Ironically, the German Fallschirmjäger (paratrooper) forces also fought in Italy with their FG42s, though there is no indication the units or weapons ever faced one another.          

 

Automatic Rifle (AR) - Often this term is used interchangeably with LMG.  The automatic rifle is normally a rifle caliber, shoulder fired machine gun containing a detachable magazine and folding bipod.  Perhaps the most famous example is the Browning BAR. Many post-war designs were essentially existing service rifles refitted with bipods and selector switches for full automatic fire, and sometimes muzzle brakes, heavier barrels, and full pistol grips.

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The Browning Automatic Rifle or BAR, was invented by John Browning during WWI.  Though superior to all other portable automatic rifles of the period, it was only to see limited use during the war, most notably in the hands of the sons inventor, Lt. Val Browning.  It saw heavy use in WWII and Korea, and soldiered into the Vietnam era.  The standard US Army infantry squad of WWII was built around one gun, while the Marines preferred up to three guns in each squad.  Its primary weakness was the lack of a quick change barrel and the limitations of a 20 round magazine.  Despite its 20+ lbs. of weight, soldiers and Marines swore by it.  Many Marines preferred their guns in a WWI configuration and so often removed the bipod to save weight .  The carrying handle, a late addition to the gun, would likely have been removed as well.

 

Battle Rifle - This term is often used to distinguish a full-sized rifle with a full automatic capability from a carbine or assault rifle.  Though intended to be fired primarily in semiautomatic, most battle rifles have provisions for emergency full automatic fire.  Normally a bipod is not fitted to this type rifle unless it is being employed as an automatic rifle or light machine gun.  Arguably the first such weapon was the FG-42 which was issued to elite German paratroopers in W.W.II.   More common examples include the American M-14, Belgian FN FAL, and German G-3.  All suffer from the same basic problem, too much weight for an individual combat weapon and excessive recoil in full automatic mode, which has led to their demise as mainstay weapons of the major world powers.
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The remarkable German FG42 was created for the Luftwaffe (Air Force) because the Fallschirmjäger (paratrooper) units were assigned to them.  After the debacle at the Battle of Crete, the paras demanded a weapon with greater range and firepower than the MP-40 SMG, but more compact and capable of emergency automatic fire, features that bolt action and semiautomatic rifles lacked.  The result was the first select fire battle rifle.  Gas operated, and complex, it proved difficult to produce and went through several iterations.  Estimates are that less than 7500 were built.    

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The FN FAL was the most common battle rifle of the free world from the late 1950s to the 1990s and was nearly adopted by the US Army, which favored the M-14 prototype.  Three major patterns exist, inch, metric, and Israeli (a combination of both patterns with a few Israeli oddities thrown in).  To a good extent, many parts will interchange between the various patterns, or can be altered to work.  During the Falklands/Malvines War both sides used the FAL as their standard service rifle.  In theory, the British had a slight logistical advantage due to their inch pattern rifles accepting captured metric magazines (though somewhat wobbly), while the reverse was not true.  Though still in service in some counties, the FAL has largely been supplanted by lighter and smaller assault rifles.

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Despite a long and checkered development period tracing back to WWII, the M-14 was a mainline service rifle in the US Army and Marine Corps for only about a decade, when it was supplanted by the M-16.  It remains in limited use today primarily as a sniper rifle and special purpose weapon.  A heavy barrel squad automatic rifle version, the M-15, was not issued because tests showed a modified M-14, called the M-14A1, performed as well.  The M-14A1 saw only brief service before being withdrawn due to excessive recoil and overheating. 

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The German G3 evolved from the Spanish CETME, which itself was a development of a late war German prototype assault rifle, the StG45.  The MP5 SMG is based on the G3 and uses the same roller locked delayed blowback action, though in a smaller package.  As with other battle rifles, the G3 has largely been replaced with smaller, handier assault rifles.

 

Assault Rifle (AR) - Although experimental and prototype examples can be traced back to the 1890s, and some limited manufacturing of the Federov Avtomat took place in Russia during WWI, the term assault rifle (or storm rifle), along with the first true mass-production belongs to W.W.II Germany.  The Wehrmacht desired a firearm blending features of the rifle, carbine, automatic rifle/light machine gun, and submachine gun into a single weapon for use by front line assault troops.  They accomplished this in their select-fire MP-43/MP-44/StG-44 series of weapons by reducing the standard 8 mm rifle cartridge to one of intermediate size and power, somewhere between that of their submachine gun round and rifle round.  This was based on evidence that suggested most maneuver warfare was conducted at ranges under 400 meters where the advantages of a long range cartridge are lost.  The concept has dominated military rifle development since W.W.II.   The Soviet AK and U.S. M-16 series of assault rifles are the most common and successful examples to date.
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Known by several names, the MP43, MP44, and StG 44, was an outgrowth of several earlier designs intended for use on the Russian front where human wave tactics demanded a handier high capacity firearm capable of engaging at ranges greater than the submachine gun but less than the slow firing bolt action rifle.  Several hundred thousand were issued and saw action on both the eastern, and to a lesser extent, western fronts.  The Soviets captured specimens and were so intrigued by both the weapon and the ammunition, that it lead to their development of the 7.62x39 round in 1943, and the prototype AK assault rifle shortly thereafter. 

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The Air Force adopted the M-16 as a base defense weapon in the early 1960s.  The Army soon acquired it, and later the improved M-16A1 (pictured), as a limited use weapon to deal with the jungle fighting of the Vietnam War.  The premature rush to field it was coupled with an initial shortage of cleaning kits, a general lack of proper training, and a change in gunpowder which accelerated fouling and wear. Coupled with a small caliber high velocity round, it soon earned a reputation among some soldiers and Marines as an unreliable "mouse gun".  The M-16A1 proved much more successful and lead to full standardization within the Army and Marine Corps.   

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The superficial similarities between the Soviet AK (left) and the Stg 44 (panel above) are readily apparent, though the AK uses a different internal design and general fabrication techniques.  Since the 1950s it has been the symbol of both communist countries and revolutionaries around the world.  Ergonomically lacking, and less accurate than the M-16, it has a well earned reputation for being extremely robust, simple, and reliable.  Many variants exist, including a compact SMG version, but all are made with either stamped or solid steel receivers, folding or fixed stocks, and in calibers 7.62 x 39, 5.45 x 39, or 5.56 x 45.  The RPK squad automatic weapon version (right) utilizes a bipod, longer barrel, and different rear stock.  Since it lacks a belt feed and quick change barrel, it has limited utility in this role. The AK series is believed to be the most mass produced firearm in history, with estimates ranging from 50 million to over 80 million produced, and still growing.         

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The M-16A2 (above) was adopted to improve the ruggedness, handiness, and long range effectiveness of the M-16.  Though it has almost completely supplanted the earlier M-16A1, it has itself been superseded to a large degree by the M-16A4 rifle (detachable carrying handle) and M-4, M-4A1 (below), and M-4A1 SOPMOD carbines.

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Submachine Gun (SMG) - The Italians are credited with inventing the SMG, though it was the Germans who first employed the concept effectively in the closing days of W.W.I.  The SMG is a full automatic or select-fire weapon that is distinctive from other machine guns due to its reliance primarily on pistol ammunition.  Since SMGs are heavier than pistols and employ shoulder stocks, they are better suited to close assault and defense.  The SMG reached its pinnacle of success in W.W.II, but the assault rifle has relegated it to a secondary role as a special purpose/police weapon.  The most famous examples include the American Thompson, German MP-40, British STEN, Russian PPSh-41, Israeli Uzi, and German MP-5.
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Pictured above is a Model 1928 Thompson SMG.   The 1928 was a simple modification of the original 1921 to reduce the rate of fire.   Designed too late to see service in WWI, it received its baptism of fire during the rum wars of the prohibition period, serving on both sides of the law.  It's first use in combat was by U.S. Marines fighting in the "banana wars" in places like Nicaragua, and in China.  The Chinese even built copies which showed up as late as the Vietnam War.  It gave great service during WWII, and though continuously revised and simplified, it was eventually replaced by the far cheaper and somewhat lighter M-3 "grease gun", much to the chagrin of many G.I.s.     

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The MP40 "Burp Gun" (referring to the sound it makes when fired) was derived from the earlier German MP38, designed and built at Erma, which had a long history of SMG manufacturing.  The MP40 was compact due its novel folding stock, and made up largely of stampings and even plastic.  It set the standard for SMGs to follow and served in large numbers during WWII.  It has erroneously been called the Schmeisser, after Hugo Schmeisser, who designed some earlier SMGs, though no evidence exists that he contributed much to the design of this gun.     

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After the huge loss of arms at Dunkirk, the British Army and Home Guard were in desperate need of firearms.  Limited quantities of Thompson SMGs were reaching England, but not enough to meet the demand.  Having captured some German MP38s and MP40s, the British issued a requirement for an even simpler gun that could be mass produced in home workshops.  The result was a design by Shepherd and Turpin at Enfield, hence the name STEN.  Though crude and suffering from magazine defects that were never fully corrected, the STEN was dirt cheap to make and its various Marks (MK II pictured) were produced in the millions at home and abroad, where they contributed significantly to the Allied victory.  They became a fixture in the proxy wars and revolutions that followed, and may even be encountered today in some remote areas.

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In Winter War of 1940 the Soviet Army suffered so many casualties at the hands of Finnish troops armed with their superb Suomi KP/-31 SMG, that they instituted a policy of mass SMG armament of their own forces.  Their initial gun, the PPD-40 was soon replaced by the cruder yet more easily mass produced PPSh-41 (Pistolet Pulemyot Shpagin) designed by Georgi Shpagin.  This weapon, more than any other, became the iconic symbol of Soviet resistance to Nazism, and until the 1960s when the AK became ubiquitous, the PPSh-41, along with the Red Star and hammer and sickle, was the most recognized sign of Communism.  

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Inspired by several Czech designs, the Israeli UZI first appeared in combat during the 1956 Suez Crisis.  It's compact size is attributed to the bolt design which telescopes over much of the barrel and lends stability to the gun during firing.  Rugged, reliable, and safe to operate, its popularity has dwindled over the years in favor of more accurate close bolt operating SMGs and compact assault rifles such as the M-4. 

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The MP5 was developed by Heckler and Koch in West Germany in the 1960s and has evolved into the most popular police and antiterrorist SMG in the world.  Offered in several pistol calibers, the most common is 9mm.  Both burst fire and full automatic versions are offered, along with a civilianized semiautomatic carbine.  Its continued popularity is due to its compact size, light weight, and closed bolt method of operation which enhances first shot accuracy, a critical component in SWAT and antiterrorism work.     

 

Machine Pistol (MP) - Generally speaking, a select fire (both semiautomatic and full automatic) pistol, usually fitted with a detachable shoulder stock.  Examples include the Mauser type "Schnellfeuer-pistole" and similar looking Astra Model 902.  More conventional looking select fire pistols include the Star MD and PD, and the Glock 18.  The Germans use this term also to describe any submachine gun (MP-40 "Burp Gun", MP-5).  With or without a stock and compensator, pistols are nearly uncontrollable in full automatic fire due to their light weight.
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The Mauser Model 712 was one of several select fire variants of the famous "Broomhanlde" pistol.

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Though outwardly very similar to the Mauser, the semiautomatic Astra 900 and select-fire 902 had improved internal lockwork.  The German SS acquired limited quantities of the Astra prior to WWII because the Wehrmacht (German Army) refused to arm them.

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This photograph shows the internal workings of a select fire Star.  Note the unique inertial wheel which allows the shooter to control the rate of fire

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The Glock 18 is one of the latest incarnations of a select-fire pistol.  The selector switch is mounted at the rear of the slide, and the compensated barrel is optional.

 

Carbine - Originally this term referred to a rifle with a shortened barrel and stock, but using the same cartridge as the standard service rifle.  It was intended primarily for issue to cavalry troops or special units for whom long range shooting was not a first priority.  Shortly before the U.S. entry into W.W.II, the Army adopted a unique, small, semiautomatic shoulder arm of incredibly light weight (5.5 lb.), which they dubbed the M-1 Carbine.  Unlike the Germans, they wanted a gun that could replace the pistol, SMG, and rifle among rear echelon troops.  Rather than shorten a rifle cartridge as the Germans did, the Americans essentially modified a stretched pistol cartridge (.32 Winchester).  Though not as powerful as the German StG-44 Assault Rifle, the carbine was so light and handy that it saw considerable front-line service in W.W.II, Korea, and Vietnam.  Late in W.W.II a previously deleted full automatic feature was restored to the carbine and magazine capacity was doubled to 30 rounds.  Guns so built or retrofitted are normally marked M-2 Carbine.  Though it is identical to an M-1 carbine receiver, today any carbine receiver marked  M-2 is considered a machine gun.  An M-2 conversion kit also is considered a machine gun.  An M-1 Carbine that does not contain the full automatic conversion parts is considered a semiautomatic rifle.  If the M-2 kit is attached, the carbine is considered a machine gun.
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M-2 select fire carbine with 30 round magazine, heavier stock, improved magazine catch, heavier rounded bolt,

and additional internal parts and selector switch (not visible)

 

Assault Carbine (CAR) - This rarely used term normally refers to shortened assault rifles and sometimes M-2 carbines.
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The XM-177E2 pictured above was one incarnation of the SMG/assault carbine version of the M-16 that appeared during the Vietnam War and was used mostly by special operations personnel.  The Air Force procured a very similar firearm which became the GAU-5 series.  The 10" - 11.5" barrels reduced bullet performance significantly, and the shortened gas system affected reliability.  The Air Force guns were given a new lease on life when the longer 14" fast twist barrel was adopted as the GUU-5P.  The Air Force has subsequently replaced most, if not all of these guns with the M-4 series used by the Army.      

 

Automatic Cannon - These are self-loading automatic weapons firing projectiles larger than .50 inches in diameter, and include the Oerlikon 20 mm cannon, M230 30mm cannon, and Bofors 40 mm cannon.   They are generally classified by BATF as destructive devices rather than machine guns, because their ammunition normally contains an explosive charge.  A variant, the chain gun, chambers and ejects rounds by means of an external power source such as an electric motor.
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The 20mm Oerlikon rapid fire cannon is a recoil operated weapon that was common on board US Navy ships during WWII to offer low altitude antiaircraft defense.

M230 automatic canon.jpg (17724 bytes)The M230 30mm automatic cannon is a single barrel chain gun powered by an outside source.  It is the primary armament of the Apache attack helicopter. Bofors.jpg (50023 bytes)

The 40mm Bofors, shown here in split quad mount, was the premier antiaircraft defense on American ships in WWII, especially against the late war Kamikaze attacks.  It soldiers on today in the AC-130 gunships of the USAF.  

 

Gatling Gun - Originally developed during the American War Between the States (1861-65), this was the worlds first practical machine gun.  It consists of several barrels arranged in a circle and rotated into firing position by a hand crank.   As each barrel comes into alignment with the feed system, a round is fed into its chamber and fired.  Ironically, because it is manually operated, it is not classified by the BATF as a machine gun. Pictured below are early, intermediate, and late model Gatling guns of the 19th century.

 

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Mini-Gun - These are later variants of the Gatling design, only powered by electric motors.  They can fire at extremely high rates (up to 6000 rounds per minute).  They are classified as machine guns when chambered for rifle ammunition (such as the manportable G.E. XM214 5.56 "Six Pack" mini-gun).  Larger cannon models, such as the M-61 Vulcan 20mm, are classified as automatic cannon.  These guns are sometimes referred to incorrectly as chainguns.

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7.62 NATO caliber GAU-17 being fired by a Marine helicopter gunner                                                                                                                    

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30mm GAU-8 from A-10 "Warthog" attack aircraft

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variant of 5.56mm GE XM214 "Six Pack"

 

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