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AR-15
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The AR-15 comes in many sizes and has many options, depending on the manufacturer. The part shown bottom center is the lower receiver, which under US law is the component legally considered the "firearm".
Type Semi-automatic rifle / Service rifle
Place of origin 22x20px United States
Service history
In service 1958–present
Production history
Designer Eugene Stoner
Designed 1957
Manufacturer ArmaLite, Colt, Bushmaster, Rock River Arms, Stag Arms, DPMS Panther Arms, Olympic Arms, and others.
Specifications
Weight 2.27 kg–3.9 kg (5.5–8.5 lb)
Barrel length
  • 24 in (610mm)
  • 20 in (508 mm) standard
  • 18 in (457 mm)
  • 16 in (406 mm)
  • 14.5 in (368 mm)
  • 11.5 in (292 mm)
  • 7 in (178 mm)
  • 6.5 in (165mm)

  • Cartridge .223 Remington, 5.56 NATO
    Action Direct impingement / Rotating bolt
    Rate of fire 800 rounds/min (fully automatic versions only)[1][2][3]
    Muzzle velocity 975 m/s (3,200 ft/s)[4]
    Effective range 400–600 m (avg 547 yd)[5][6][7]
    Feed system Various STANAG magazines.
    Sights Adjustable front and rear iron sights

    The AR-15 is a lightweight, 5.56 mm, air-cooled, gas-operated, magazine-fed semi-automatic rifle, with a rotating-lock bolt, actuated by direct impingement gas operation or long/short stroke piston operation. It is manufactured with the extensive use of aluminum alloys and synthetic materials.

    The AR-15 was first built by ArmaLite as a selective fire assault rifle for the United States armed forces. Because of financial problems, ArmaLite sold the AR-15 design to Colt. The select-fire AR-15 entered the US military system as the M16 rifle. Colt then marketed the Colt AR-15 as a semi-automatic version of the M16 rifle for civilian sales in 1963.[8] The name "AR-15" is a Colt registered trademark, which refers only to the semi-automatic rifle.

    HistoryEdit

    The AR-15 is based on the 7.62 mm AR-10, designed by Eugene Stoner, Robert Fremont and L. James Sullivan of the Fairchild ArmaLite corporation.[9] The AR-15 was developed as a lighter, 5.56 mm version of the AR-10. The "AR" in AR-15 comes from the ArmaLite name. ArmaLite's AR-1, AR-5, and some subsequent models were bolt action rifles, the AR-7 a semiautomatic survival rifle and there are shotguns and pistols whose model numbers include the "AR" prefix.[9]

    1973 Colt AR15 SP1

    1973 Colt AR-15 SP1 rifle with 'slab side' upper receiver (lacking raised boss around magazine release button) and original Colt 20 round box magazine

    ArmaLite sold its rights to the AR-10 and AR-15 to Colt in 1959. After a tour by Colt of the Far East, the first sale of AR-15s were made to Malaysia on 30 September 1959 with Colt's manufacture of their first 300 AR-15s in December 1959.[10] Colt marketed the AR-15 rifle to various military services around the world, including the U.S. Navy, Air Force, Army, and Marine Corps. The AR-15 was eventually adopted by the United States military under the designation M16. However, Colt continued to use the AR-15 trademark for its semi-automatic variants (AR-15, AR-15A2) which were marketed to civilian and law-enforcement customers. The original AR-15 was a very lightweight weapon, weighing less than 6 pounds with empty magazine, though later heavy-barrel versions of the civilian AR-15 can weigh upwards of 8.5 lbs.[11]

    Today the AR-15 and its variations are manufactured by many companies and have captured the affection of civilian shooters and police forces around the world due to their accuracy and modularity. (Please refer to the M16 for more history on the development and evolution of the AR-15 and derivatives.)

    The trademark "AR15" or "AR-15" is registered to Colt Industries, which maintains that the term should only be used to refer to their products. Other AR-15 manufacturers make AR-15 clones marketed under separate designations, although colloquially these are sometimes referred to by the term AR-15.

    Some notable features of the AR-15 include:

    • Aircraft grade forged 7075-T6 aluminium receiver is lightweight, highly corrosion-resistant, and easy to machine
    • Modular design allows the use of numerous accessories such as after market sights, vertical forward grips, lighting systems, night vision devices, laser targeting devices, muzzle brakes/flash hiders, sound supressors, bipods, etc. and makes repair easier
    • Straight-line stock design eliminates the fulcrum created by traditional bent stocks, reducing muzzle climb.
    • Small caliber, accurate, light weight, high velocity round (.223/5.56x45mm)
    • Easily adapted to fire numerous other rounds
    • Front sight adjustable for elevation
    • Rear sight adjustable for windage (most models) and elevation (some models)
    • Wide array of optical aiming devices available in addition to or as replacements of iron sights
    • direct impingement gas system (as designed) with short or long stroke gas piston, or direct blowback operating systems available
    • Synthetic pistol grip and butt stock that do not swell or splinter in adverse conditions (regulated in some states)
    • High capacity magazine available where legal
    • Ergonomic design that makes the charging handle, selector switch (safety), magazine release, and bolt catch assembly easy to access.
    • 4 MOA Accuracy as a MILSPEC standard
    AR15 Sight Picture

    AR-15 sight picture

    Semi-automatic AR-15s for sale to civilians are internally different from the full automatic M-16, although nearly identical in external appearance. The hammer and trigger mechanisms are of a different design. The bolt carrier and internal lower receiver of semi-automatic versions are milled differently, so that the firing mechanisms are not interchangeable. This was done to satisfy BATF requirements that civilian weapons may not be easily convertible to full-automatic. Despite this, through use of a "Drop In Auto Sear" or "lightning-link," conversion to full automatic is very straightforward (sometimes requiring slight modification to the bolt carrier).[12][13] Such modifications, unless using registered and transferable parts made prior to May 19, 1986, are illegal. (The Firearm Owners Protection Act in 1986 has redefined a machinegun to include individual components where a semiautomatic firearm can be converted to full-automatic based on a 1981 BATF ruling on machinegun parts.)

    Automatic variants have a three-position rotating selective fire switch, allowing the operator to select between three modes: safe, semi-automatic, and either automatic or three round burst, depending on model. Civilian AR-15 models do not have three-round burst or automatic settings on the fire selector. In semi-automatic only variants, the selector only rotates between safe and semi-automatic. Due to this, weapons modified to full automatic using a lightning-link are capable of full automatic fire only—unless a special full automatic fire select mechanism and modified selector-switch is substituted.[12]

    Operating mechanismEdit

    M16 rifle Firing FM 23-9 Fig 2-7

    Diagram of an M16 rifle, firing

    The main mechanism of operation for the rifle is known as direct gas impingement. Gas is tapped from the barrel as the bullet moves past a gas port located above the rifle's front sight base. The gas rushes into the port and down a gas tube, located above the barrel, which runs from the front sight base into the AR-15's upper receiver. Here, the gas tube protrudes into a “gas key” (bolt carrier key) which accepts the gas and funnels it into the bolt carrier.

    The bolt and bolt carrier together form a piston, which is caused to expand as the cavity in the bolt carrier fills with high pressure gas. The bolt is locked into the barrel extension, so this expansion forces the bolt carrier backward a short distance in line with the stock of the rifle to first unlock the bolt. As the bolt carrier moves toward the butt of the gun, the bolt cam pin, riding in a slot on the bolt carrier, forces the bolt to turn and unlock from the barrel extension. (The gas system only serves to unlock the bolt while the projectile has long exited the barrel). Once the bolt is fully unlocked it begins its rearward movement along with the bolt carrier. The bolt's rearward motion extracts the empty cartridge case from the chamber, and as soon as the neck of the case clears the barrel extension, the bolt's spring-loaded ejector forces it out the ejection port in the side of the upper receiver. The bolt is much heavier than the projectile, and along with the recoil-spring pressure inside the stock buffer-tube performs the cartridge ejection function and chambers the following cartridge.

    Behind the bolt carrier is a plastic or metal buffer which rests in line with a return spring that pushes the bolt carrier back toward the chamber. A groove machined into the upper receiver traps the cam pin and prevents it and the bolt from rotating into a closed position. The bolt's locking lugs then push a fresh round from the magazine which is guided by feed ramps into the chamber. As the bolt's locking lugs move past the barrel extension, the cam pin is allowed to twist into a pocket milled into the upper receiver. This twisting action follows the groove cut into the carrier and forces the bolt to twist and “lock” into the barrel’s unique extension.

    VariantsEdit

    AR-15 Sporter SP1 Carbine

    Colt AR-15 Sporter SP1 Carbine

    The AR-15 rifle is available in a wide range of configurations from a large number of manufacturers. These configurations range from short carbine-length models with features such as adjustable length stocks and optical sights, to heavy barrel models.

    Due to the rifle's modular design, one upper receiver can quickly and easily be substituted for another. There are many aftermarket upper receivers that incorporate barrels of different weights, lengths and calibers. Some available calibers for the AR-15 platform are the .223 Remington/5.56x45mm, .45 ACP, 5.7x28mm, 6.5 mm Grendel, .338 Lapua,[14] 6.8 mm Remington SPC,[15] and .50 Beowulf.[16] it is not recommended to chamber the 5.56x45 NATO into a rifle designated 223 Remington, due to the slighly increased chamber pressure in the 5.56mm cartridges, the two calibers are similar, but not identical.

    AR15 A3 Tactical Carbine pic1

    Colt AR-15 A3 Tactical Carbine. Rifle is shown with a CQB Tactical Sling and a Colt 4x20 scope.

    When installing a new complete upper receiver, particularly one designed to handle a different caliber of ammunition (i.e., other than .223 Remington or 5.56x45 mm NATO), some modification to the contents of the lower receiver may be required, depending on the particular conversion. For example, a conversion to 9 mm typically would involve the installation of a magazine well block (to accommodate a typical 9 mm magazine, such as Uzi or Colt SMG), replacing the .223 hammer with one designed for 9 mm ammunition, and depending on the original stock, replacing the buffer, action spring and stock spacer with those designed for the new 9 mm AR-15 configuration. The 9mm cartridge fires from an unlocked breech, or straight blow-back—rather than a locked breech, because the spring and bolt provide enough weight to allow this type of functioning. These guns do not utilize the direct gas impingement method of operation like the original.

    Some AR-15's like the POF, LWRCI, H&K, Sturm Ruger, Sig Sauer, and Adams arms offerings replace the DGI (direct gas impingement) operating system with a short stroke/long stroke gas piston system. These guns usually have modified bolt carriers, gas keys, and gas blocks. When fired, DGI systems dump high pressure hot gas through the gas tube to the bolt carrier key and into the bolt carrier group. This can rapidly heat up the bolt carrier group and cause excessive fouling, one of the main complaints about the design. Gas piston operating systems alleviate these problems, but can be the cause of other issues such as bolt carrier tilt.

    Upper and lower receivers machined from a solid billet (block) of aluminum as opposed to an aluminum forging are offered by some manufactures. These include Sun Devil manufacturing, LAR Grizzly manufacturing, POF-USA, and Black Rain. This is usually done for added strength.

    Upper receivers utilizing a monolithic rail system that combine a railed hand guard and upper receiver into one uninterrupted piece are made by companies like Colt's Manufacturing Company, POF-USA, and VLTOR. This is done to provide a continuous uninterrupted rail section that runs along the top of the gun from the weapons charging handle to the front sight/gas block. This rail section is used for the mounting of sights, laser aiming devices, night vision devices, and lighting systems.

    A side charging upper receiver has been developed by LAR Grizzly. The charging handle can be had in a left side, right side, or ambidextrous configuration. Since the charging handle is attached to the bolt carrier making it a reciprocating design, it can be utilized as a forward assist device as well.

    Early models had a 1:14 rate of twist for the original 55 grain (3.6 g) bullets. This was changed to 1:12 when it was found that 1:14 was insufficient to stabilize a bullet when fired in cold weather. Most recent rifles have a 1:9 or 1:7 twist rate. There is much controversy and speculation as to how differing twist rates affect ballistics and terminal performance with varying loads, but heavier projectiles tend to perform better with faster rifling rates.[17] Additionally, the various non .223 / 5.56 calibers have their own particular twist rate, such as 1:10, 1/11 and 1/12 for 6.8x43mm SPC, 1/10 7.62x39mm, and 1:12 for .308 Winchester.

    Colt AR-15 on display at the NFM

    A Colt AR-15 on display at the National Firearms Museum. This example is fitted with an early waffle-patterned 20-round magazine.

    Standard issue magazines are 20 or 30 round staggered-column magazines, traditional box magazines exist in 40 and 45 round capacities, and usable magazines have been constructed from a variety of materials including steel, aluminum, and high-impact plastics. Drum magazines with 90 and 100 round capacities exist, such as Beta C-Mags. Low-capacity magazines, usually of a 5 or 10 round capacity, are available to comply with some areas' legal restrictions, hunting, and because larger magazines can inhibit shooting from a benchrest. Surefire is now offering extended capacity magazines in 60 and 100 round capacity configurations. These magazines are a staggered column design.

    Legal statusEdit

    AustraliaEdit

    AR-15 rifles, like all semi-automatic rifles, are subject to strong restrictions of ownership in all states and territories in Australia. The only means of legally owning an AR-15/M16-type rifle in Australia today beyond law enforcement is to have a Category D Firearms License (e.g. a professional animal culler), to have a Firearms Collector's License and the firearm deactivated (with the barrel plugged up and the action welded shut), or converted to blank fire if one is a member of a military re-enactement organization.

    The heavy restrictions on semi-automatic rifles was introduced in 1996 in response to the Port Arthur massacre – one of the firearms used in the attack was an AR-15. Before 1996, AR-15 rifles were legal to own in a number of Australian states and territories, namely Queensland and Tasmania.

    AustriaEdit

    In Austria, semi-automatic centerfire rifles have to be classified as sporting or hunting firearms in order to obtain civilian-legal status. After this classification, they are considered "category B" firearms, which means that holders of gun licenses may own them. These licenses are may-issue items if the applicant specifies a valid reason (self-defense at home for example is considered valid by law in any case), passes a psychological test and attends a gun-basics course. Currently, only one centerfire AR-15 version, produced by German manufacturer "Oberland Arms" was given the B-classification. This Austrian version differs slightly from the original design in order to ensure that no military full-auto trigger, bolt and barrel may be installed. Additionally, bayonet lugs and flash hiders are prohibited on semi-automatic rifles while Muzzle brakes and compensators are legal. There is no minimum length for barrels, therefore even barrel lengths as short as 7.5" are possible.

    CanadaEdit

    The Government of Canada classifies the AR-15 (and its variants) as a restricted firearm. For anyone wanting to lawfully own an AR-15, they must first pass a "Canadian Non-Restricted Firearms Safety Test", and then a "Canadian Restricted Firearms Test". This allows the applicant to obtain a Possession and Acquisition License (PAL) valid for restricted firearms, subject to approval.[18][19] With the introduction of strict gun control measures by former Prime Minister Jean Chrétien (Bill C-68), the AR-15 had originally been intended to be classified as a prohibited firearm, making it all but impossible to privately own one, however due to the presence of nationwide Service Rifle target shooting competitions, the AR-15 was granted a sporting exception.

    As with all Restricted firearms (including most pistols, some shotguns, and some rifles) AR-15s are allowed to be fired only at certified firing ranges. In order to legally own and transport a Restricted firearm, the firearm must be registered with the Royal Canadian Mounted Police Canadian Firearms Program and must apply for an Authorization to Transport (or ATT) from the Chief Firearms Officer (CFO) for their province or territory. Additionally, the firearm must be unloaded, deactivated by a trigger or action lock, and be in a locked, opaque container during transport.[20]

    The issuance of ATTs varies considerably from province to province, and is generally reflective of a particular province's political and social levels of acceptance toward gun ownership. In Ontario the only way to obtain an ATT for restricted firearms is to become a member of a range. For example, in Alberta, where firearms ownership is widely accepted, generally a single ATT is promptly issued that allows citizens to transport firearms to border crossings, gunsmiths, and shooting ranges. Firearms transfers in provinces such as Quebec can take up to 3 months to process. Script error[citation needed]

    Germany and FinlandEdit

    In Germany and Finland, possession of semi-automatic rifles, including the AR-15, is legal, provided that the rifle's owner acquires a permit for owning one. A license is required for each individual firearm and there needs to be a specific reason for ownership such as participation in the shooting sports and hunting.

    For German hunters, their semi-automatic firearm's magazine must be modified in such a way that its maximum capacity is only 2 rounds (excluding handguns), meaning that when hunting only 3 shots in total can be fired (as one additional round is loaded in the chamber) without reloading.

    SwedenEdit

    The AR-15, like all other semi-automatic rifles, is legal for individuals who need one for competitive use (IPSC rifle or 3-gun matches). A valid competition license is required, and all weapons are registered with the police. There are no banned "assault weapon" features or parts. However, the AR-15 is not allowed for hunting use.

    United Kingdom Edit

    As with all semi-automatic, centerfire rifles, AR-15s are classed as a Section 5 weapon (i.e. a person must provide an exceptional reason and gain permission from the Home Secretary, making ownership all but impossible for a private citizen.) However, AR-15s in a manually operated straight pull configuration or semi-automatic AR-15s that are chambered to fire a .22 rimfire cartridge are legal and can be held on a standard Section 1 Firearms Certificate. There are no restrictions on 'assault weapon features' in the UK, and no restrictions on magazine capacity. There are a number of UK manufacturers of "straight-pull" AR-15 variants. Southern Gun Company has tried to introduce a 9mm "self-ejecting" variant for gallery rifle shooting nicknamed the "Unicorn" but, despite numerous units being sold on the understanding that the rifle was a compliant Section 1 firearm, the rifles were seized and subjected to stringent testing by the UK licensing authority's Forensic Science Services (FSS). A small number of pre-production models were found to be non-compliant with section 1 status. However, later models were deemed Section 1 compliant and were returned to their owners.

    United StatesEdit

    There are no federal restrictions on the ownership of AR-15 rifles in the United States. During the period 1994–2004 variants with certain features such as collapsible stocks, flash suppressors, and bayonet lugs were prohibited for sales to civilians by the Violent Crime Control and Law Enforcement Act of 1994, with the included Assault Weapons Ban. Included in this was a restriction on the pistol grip that protrudes beneath the stock, which was considered an accessory feature under the ban and was subject to restrictions. Some rifles were manufactured with a grip not described under the Ban installed in its place. Those AR-15s that were manufactured with those features were stamped, "Restricted Military/Government/Law Enforcement/Export Only" as well as the accompanying full capacity magazines. The restrictions only applied to guns manufactured after the ban took effect. It was legal to own, sell, or buy any gun built before 1994. Hundreds of thousands of pre-ban ARs were sold during the ban as well as new guns redesigned to be legal.

    Since the expiration of the Federal AWB in September 2004,[21] these features became legal in most states.[22] Since the expiration of the ban the manufacture and sale of then-restricted rifles has resumed completely.

    At least two states regulate possession of AR-15 rifles either by the restriction of certain features or outright bans of certain manufacturers' models. For example: the A3 tactical carbine pictured above is legal for sale and possession in the United States generally, but is illegal for sale in California.

    Individual statesEdit

    CaliforniaEdit

    Legal aspects of an AR-15 Edit

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    Under U.S. firearms laws, only the lower receiver of the AR-15 is considered a firearm and subject to purchasing restrictions. (This is not universally the case with rifles. On some other rifles, such as the FN FAL, Heckler & Koch 91, 93, (G-3, G-33), 94, MP-5 or SP-89 (plus clones), the upper receiver is the serial-numbered part, and thus the firearm.) The AR-15 upper receiver assembly is considered a part, and may be purchased and mail-ordered in most locations. This is a desirable feature for enthusiasts, who can purchase a number of upper receivers (often in different calibers and barrel lengths) and interchange them with the same lower receiver.

    Adding a shoulder stock to an AR-15 with a barrel shorter than 16" would constitute constructing a Short-Barreled Rifle (SBR) under NFA rules – subjective to a $200 tax stamp. Constructing an AR-15 pistol using a lower receiver which had already been designated a rifle by the manufacturer (shipped out for distribution), not just described as such on an BATFE form 4473 when sold only as a receiver would constitute the construction of such a firearm, since the pistol was constructed from an existing rifle. The receiver, or serial-numbered part is still considered a firearm, but a receiver has unique status assigned by the Gun Control Act of 1968 as amended, and ATF regulations or rulings. ATF ruling 07-07-2009 illustrates a receiver's unique legal status even if the receiver can only be made into a rifle.[23] Under the US v Thompson-Center Supreme Court ruling, an individual can possess parts for both the rifle and pistol so long as they are not assembled improperly.[24] This SCOTUS ruling has been further clarified by the ATF Director in a ruling (ATF Ruling 2011-4[25] ) dated July 25, 2011 which restates most of the findings in the Thompson case.

    If a lower receiver is designated and transferred as a pistol from an FFL dealer to a consumer purchaser, the owner can either assemble it as it was intended in pistol form or make a rifle out of it by installing a butt stock to lower pistol receiver and mate it with an upper receiver that possesses the federal minimum length of a 16" barrel (or short-barreled rifle if the barrel is less than 16" long and the appropriate tax stamp fee of $200 on a Form 1 PRIOR to construction). This change effectively creates legally a long gun which cannot be reverted back to a pistol configuration or the person would be in violation of having 'created' a short-barrel rifle. However, the saying "once a rifle always a rifle" comes into play as BATFE maintains that the finding in US vs. Thompson Contender, Inc. only applies to products of Thompson Contender and not to any other companies' products. With Thompson Contender products, the Supreme Court has ruled as above. No person/company to date has challenged the BATFE on this point with respect to other products under the same ruling, and as such, is untested legal grounds This has changed under atf ruling 2011–4 which states "A firearm, as defined by the National Firearms Act (NFA), 26 U.S.C. 5845(a)(3), is made when unassembled parts are placed in close proximity in such a way that they: (a) serve no useful purpose other than to make a rifle having a barrel or barrels of less than 16 inches in length; or (b) convert a complete weapon into such an NFA firearm. A firearm, as defined by 26 U.S.C. 5845(a)(3) and (a)(4), is not made when parts within a kit that were originally designed to be configured as both a pistol and a rifle are assembled or re-assembled in a configuration not regulated under the NFA (e.g., as a pistol, or a rifle with a barrel or barrels of 16 inches or more in length). A firearm, as defined by 26 U.S.C. 5845(a)(3) and (a)(4), is not made when a pistol is attached to a part or parts designed to convert the pistol into a rifle with a barrel or barrels of 16 inches or more in length, and the parts are later unassembled in a configuration not regulated under the NFA (e.g., as a pistol). A firearm, as defined by 26 U.S.C. 5845(a)(4), is made when a handgun or other weapon with an overall length of less than 26 inches, or a barrel or barrels of less than 16 inches in length, is assembled or produced from a weapon originally assembled or produced only as a rifle." Effective July 25, 2011 Furthermore, adding a forward pistol grip to an AR-15 designated as a pistol constitutes manufacture or an AOW (any other weapon). Both of these actions require an approved "Form 1" and payment of a $200 tax for the short barrel conversion or a $5 tax for the AOW conversion PRIOR to the actual construction of the item. Current wait times for approval average 3–4 months during which time no modifications or construction may be done.

    MalfunctionEdit

    With the plethora of manufacturers of complete weapons and aftermarket barrels, there is a potential hazard associated with chamber specifications. Both civilian (SAAMI) specification .223 Remington and 5.56 mm NATO are available. Though the external dimensions of the two cases are the same and both chambers typically accept both types of ammunition, the firing of military specification ammunition in civilian specification chambers can produce chamber pressures greater than the barrel is designed to handle. Internally the 5.56x45mm case wall is thicker, and the round itself is typically loaded to produce higher pressure than the .223. The most common result of firing military 5.56x45mm ammunition in a .223 Remington chamber is that the primer can be forced out of the case by chamber pressure, often resulting in the primer becoming lodged somewhere in the action of the rifle, and disassembly of the rifle is often necessary to remove the jammed primer.[26] Military specification chambers typically have a more open throat area producing less pressure and can handle both types of ammunition.

    A few AR-15 manufacturers incorporate the use of a hybrid chamber specification known as the Wylde chamber. Designed by and named after Bill Wylde, this chambering was designed to accurately shoot the military ball ammo of the day while still feeding reliably. Coincidentally, it shoots the longer 80 gr bullets commonly used in the sport of Highpower Rifle Competition very well and is one of the preferred chambers for that use. While the Wylde chamber allows for optimal seating depth of 80 grain bullets over .223 Remington and 5.56 NATO, it is capable of accepting both ammunition types. The Wylde chamber is used by a few manufacturers who sell "National Match" configuration AR-15 rifle, barrels, and upper receivers. The type of chamber, manufacturer, and rifling twist in inches is typically found stamped into the barrel in front of the front sight assembly. An additional point of concern in the design is the inertial firing pin. A lightweight firing pin rides in a channel inside the bolt unrestrained. When the bolt locks forward during loading, the firing pin typically rides forward and impacts the primer of the chambered round. In military specification ammunition and quality civilian ammunition, this is not normally enough to fire the round and only leaves a small "ding" on the primer. With more sensitive primers or improperly seated primers, this can cause a slamfire during loading.[27]

    Note: This situation is particularly poignant for owners of AR-15 rifles as a previous non-felon named David Olofson, an Army Reservist with 16 years in the US Army, loaned a 20-year-old AR-15 rifle to a prospective buyer for four months which was found to have fired multiple rounds on a single trigger pull at a gun range. After law enforcement intervention, he was charged with and found guilty in January 2008 of illegally transferring a machinegun when the AR-15 was found to have malfunctioned (defense contention)/purposely-modified (prosecution contention), was sentenced to thirty months in the Sandstone FCI federal prison in Wisconsin by a Federal Judge. The end result of this case finds that any firearm which produces more than one discharge per pull of the trigger, is a machinegun, and thereby, its possessor or transferor, unless registered under provisions of the NFA can be tried and convicted of a felony offense.

    AR-15 manufacturers Edit

    Alternative AR-15 Calibers Edit

    Rifle Cartridges Edit

    Metric Edit

    Inches Edit

    See alsoEdit

    ReferencesEdit

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    8. Blue Book Publications – COLT'S MANUFACTURING COMPANY, LLC AR-15, Pre-Ban, 1963–1989 Mfg. w/Green Label Box. Store.bluebookinc.com. Retrieved on 2011-09-27.
    9. 9.0 9.1 Script error
    10. p.96 Dockery, Kevin Future Weapons Berkley Books, 2007
    11. Script error
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    13. http://www.onlylongrange.com/badnews.asp
    14. U.S. Military Small Arms Ammunition Failures and Solutions, GK Roberts, NDIA Dallas, TX, 21 May 2008 http://www.dtic.mil/ndia/2008Intl/Roberts.pdf
    15. Evolution of an AR | Gear | Guns & Ammo. Archives.gunsandammo.com (2011-08-29). Retrieved on 2011-09-27.
    16. Miller, Don. How Good Are Simple Rules For Estimating Rifling Twist, Precision Shooting – June 2009
    17. Firearms Safety Training, Canadian Firearms Centre (CFC)
    18. List of Restricted and Prohibited Firearms, Canadian Firearms Centre (CFC)
    19. Script error
    20. Script error [dead link]
    21. Script error [dead link]
    22. Script error
    23. TC V. U.S. 91–164. Caselaw.lp.findlaw.com. Retrieved on 2011-09-27.
    24. Script error
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    External linksEdit

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