The rest of the barrel was maintained at the original thickness to enable the M203 grenade launcher to be attached. As a lifelong gun owner he knows his stuff!  In tests conducted in 2005 and 2006 the Army found that on average, the new M4s and M16s fired approximately 5,000 rounds between stoppages.  Weighing only 0.6 lb, the simple and non-adjustable bipod clamps to the barrel of the rifle to allow for supported fire. You may not need NICS check or an FFL to build a weapon, but you will need additional tools, like a drill press or lathe and technical skills to assemble a 100% receiver. According to currently adopted terminology, under the M16 term it is considered a select fire rifle and with an AR-15 name people usually recognize rifle with semi-automatic fire only. Also "the M14 was preferred by 15 percent, while less than one percent wished to carry either the Stoner rifle, the AK-47, the carbine or a pistol.  The action was also modified, replacing the fully automatic setting with a three-round burst setting. In January 1963, Secretary McNamara received reports that M14 production was insufficient to meet the needs of the armed forces and ordered a halt to M14 production. Before answering this question, you should note that the AR-15 comes in two variants: Commercial and Mil-Spec.  The 5.56 mm round had to penetrate a standard U.S. helmet at 500 yards (460 meters) and retain a velocity in excess of the speed of sound, while matching or exceeding the wounding ability of the .30 Carbine cartridge. However, for the collectors and re-enactors, you can find some semi-automatic AR-15 lower receivers with the words "safe", "semi" and "auto/burst" or three pictographs for the same functions. We don’t use foreign made parts, polymer parts, or MIM parts.  However, a minority of failures occurred in spite of multiple hits to the chest. Original M16 (manufactured by Armalite and Colt) M4. It will operate without degradation even if the rifle is fired at the maximum rate of fire.  In the late 1950s, designer Eugene Stoner was completing his work on the AR-15. These were effectively used by the British Special Air Service during the Falklands War.. The forging process makes the strongest aluminum form, which is very suitable for a heavy-duty M16 that you plan to use often. With the advent of the M16A2, a new fully adjustable rear sight was added, allowing the rear sight to be dialed in for specific range settings between 300 and 800 meters and to allow windage adjustments without the need of a tool or cartridge. On the flipside, these rugged and good-looking lowers are inherently weaker than forged receivers are. After modifications (most notably, the charging handle was re-located from under the carrying handle like the AR-10, to the rear of the receiver), the new redesigned rifle was renamed the Rifle, Caliber 5.56 mm, M16. Stock and Buffer Tube kits . The M16A1 was the finalized production model in 1967 and was produced until 1982. Free shipping and returns on Although AR-15/M16 lower receivers exist in steel and titanium iterations, they are commonly constructed from two types of materials- aluminum and polymer. As more units adopted the AR-15, Secretary of the Army Cyrus Vance ordered an investigation into why the weapon had been rejected by the Army. Currently, the M16 is in use by 15 NATO countries and more than 80 countries worldwide. It was replaced by the SAR 21, which was introduced during 1999 and 2000, but is still kept for reserve forces. Meanwhile, the Army relented and recommended the adoption of the M16 for jungle warfare operations.  A replacement was needed: a medium between the traditional preference for high-powered rifles such as the M14, and the lightweight firepower of the M2 Carbine. While it keeps a middle ground regarding price, Aero Precision lower is the no-frills workhorse compared to other more expensive counterparts. Featured Products. Based on its select-fire versions such as M16A2/A3 and the M4 service rifles, the civilian semi-automatic version of the AR-15 has become the most popular rifle for sportsmen, home defenders and firearm enthusiasts in the United States. While there are no logos or markings on the right side, this well-built piece faithfully replicates the left side markings found on the actual M16A4 rifles such as "Property of the USA" and "MOD M16A4." , In 1928, a U.S. Army 'Caliber Board' conducted firing tests at Aberdeen Proving Grounds and recommended transitioning to smaller caliber rounds, mentioning in particular the .27. Why it's become the longest serving rifle in the recent US military history! REPORT OF TASK NO. The final Air Force GAU-5/A and Army XM177E2 had an 11.5 in (292 mm) barrel with a longer flash/sound suppressor. The M231 Firing Port Weapon (FPW) is an adapted version of the M16 assault rifle for firing from ports on the M2 Bradley. 13A. This tube relieves pressure on the barrel caused by standard handguards and greatly increases the potential accuracy of the system. Joined Jul 2003; Posts 154; EE Offline; MO, USA. Colt also returned to the original "Commando" idea, with its Model 733, essentially a modernized XM177E2 with many of the features introduced on the M16A2. The current USMC OKC-3S bayonet bears a resemblance to the Marines' iconic Ka-Bar fighting knife with serrations near the handle. Because the bolt is prevented from moving forward by the barrel, the carrier is driven to the rear by the expanding gases and thus converts the energy of the gas to movement of the rifle's parts. The wide range of m16 lower ensures that all shoppers acquire their desired styles and designs, color, among other specifications. Variant. Since its founding, Brownells has been a parts company, but from 2018 they started introducing their first line of firearms. . Billet aluminum lowers are machined and milled from a solid block of pure aluminum on CNC machines. In Stock.  Lack of proper lubrication is the most common source of weapon stoppages or jams. The FN M16A4, using safe/semi/burst selective fire, became standard issue for the U.S. Marine Corps.  Weapons designed to accept both the M193 or SS109 rounds (like civilian market clones) usually have a 6-groove, right hand twist, 1 turn in 9 inches (1:228.6 mm) bore, although 1:8 inches and 1:7 inches twist rates are available as well. It may be an arguable statement, but the most important things that an average AR builder wants from his lower receiver are the good fit, ergonomics, and finish. Intensive training programs in weapons cleaning were instituted including a comic book-style operations manual. and a Spikes ST-T2 tungsten heavy buffer. , The original ammunition for the M16 was the 55-grain M193 cartridge. While forged and machined to the same specifications as the company's full-price options, the Brownells is selling these blemished AR-15/M16A1 lower receivers at a bargain price.  The stock being in line with the bore also reduces muzzle rise, especially during automatic fire. The South Vietnam soldiers issued glowing reports of the weapon's reliability, recording zero broken parts while firing 80,000 rounds in one stage of testing, and requiring only two replacement parts for the 1,000 weapons over the entire course of testing. All current M16 type rifles can mount under-barrel 40 mm grenade-launchers, such as the M203 and M320. AR15 Lower Parts Kit – Complete. NATO Stock Number of NSN 1005-01-591-5825, PN 1001V, RIFLE, 5.56-MM, XM16E1. , However, there have been repeated and consistent reports of the M855's inability to wound effectively (i.e. Advanced Research Projects Agency. Besides that, few owners complained that they find the "fire & safe" markings on both sides of the receivers which is not historically accurate for an "A1" retro lower. Lower Parts . The Brownells blemished AR-15 XM16E1 lower receivers come with the same quality forging and machining as the QC-approved receivers. 25 November 1983 p. 1-3, The Mechanized Infantry Platoon and Squad (APC).  And, while the M2 carbine offered a high rate of fire, it was under-powered and ultimately outclassed by the AK-47. , M16s were produced by Colt until the late 1980s, when FN Herstal began to manufacture them. The gas system, bolt carrier, and bolt-locking design were novel for the time. The M16 was billed as self-cleaning (when no weapon is or ever has been). Obviously, the fully completed lower assembly will help you avoid making any costly mistakes. , In December 2006, the Center for Naval Analyses (CNA) released a report on U.S. small arms in combat. 83 percent (986 troops) did not need their rifles repaired while in theater. Being almost one-third the weight of the .30 meant that the soldier could sustain fire for longer with the same load.  According to a 1968 Department of Army report, the M16A1 rifle achieved widespread acceptance by U.S. troops in Vietnam. news; Sample Page; Donate Now In short a word, the AR-15 is a line of self-loading weapons for regular civilian and sporting use. 80% Aluminum Lower Receiver, with Mil Spec finish.  The M16's action works by passing high pressure propellant gasses tapped from the barrel down a tube and into the carrier group within the upper receiver, and is commonly referred to as a "direct impingement gas system". , In 2014, Marine units were provided with a limited number of adjustable stocks in place of the traditional fixed stock for their M16A4s to issue to smaller Marines who would have trouble comfortably reaching the trigger when wearing body armor.  "In Fallujah, [Iraq] Marines with ACOG-equipped M16A4s created a stir by taking so many head shots that until the wounds were closely examined, some observers thought the insurgents had been executed. Quick view Retro Rifles. The rail was originally for scopes. At closer ranges (typically inside 15–20 meters), the shooter must compensate by aiming high to place shots where desired. This maximum range is only of safety interest, not for combat firing. In the early stages, Brownells had a problem with one commitment segment of the AR community who preferred the original Colt XM grey finish. (Although many .22 caliber conversion kits are made for the AR-15, the rimfire versions are only cosmetic similar rifles.). , In 1969, the M16A1 officially replaced the M14 rifle to become the U.S. military's standard service rifle.  The front sight is a post adjustable for elevation in the field. Designed with full and semi-automatic capabilities, the weapon initially did not respond well to wet and dirty conditions, sometimes even jamming in combat. Complete Firearms ... M16 PARTS . … All of our receivers are marked Safe, Semi, Auto and come finished in a Type 3 Hard Coat Finish in a rich black color. The forging process makes the receiver stronger than a cast or billet. In the summer of 1961, General LeMay was promoted to U.S. Air Force chief of staff, and requested 80,000 AR-15s. 39.5 in / 1,003 mm. Firing Mark 262 Mod 0 ammunition with a 77gr Open tip Match bullet, the system has an official effective range of 600+ meters.  The USMC has retired the M16A2 in favor of the newer M16A4; a few M16A2s remain in service with the U.S. Army Reserve and National Guard, Air Force, Navy and Coast Guard. Sights. This accumulating carbon and vaporized metal build-up within the receiver and bolt-carrier negatively affects reliability and necessitates more intensive maintenance on the part of the individual soldier. LOWER RECIEVERS and LOWER KITS .  This upgrade is designed to maximize performance of the 5.56×45mm round, to extend range, improve accuracy, increase penetration and to consistently fragment in soft-tissue when fired from not only standard length M16s, but also the short-barreled M4 carbines. The buttstock was lengthened by 5⁄8 in (15.9 mm). , mag catch assy., front pivot pin, rear takedown pin, 2 takedown pin springs, 2 takedown pin detents, A-2 pistol grip, pistol grip screw, pistol grip screw washer, buffer detent, and buffer detent … Joy. Currently, most of the standard M16 lowers are machined from aluminum. Thus, the HEL M4 suppressor was permanently mounted though it allowed normal semi-automatic and automatic operation. Complete as an A2 lower or use as a blank canvas. The barrel profile under the handguards remained the same as the M16A1 for compatibility with the M203 grenade launcher. These versions were also known as the Colt Commando model commonly referenced and marketed as the CAR-15.  Modern versions such as M16A4 have a detachable carrying handle and use Picatinny rails, which allows for the use of various scopes and sighting devices. , As a result, the Army was forced to reconsider a 1957 request by General Willard G. Wyman, commander of the U.S. Continental Army Command (CONARC) to develop a .223-inch caliber (5.56 mm) select-fire rifle weighing 6 lb (2.7 kg) when loaded with a 20-round magazine. If you are searching for read reviews Cesaroni 54mm Reload Kit And Ar15 M16 Lower Receiver Vise Block Lower Brownells Se price. So what’s exactly the difference between the M16 or AR15? Total worldwide production of M16s is approximately 8 million, making it the most-produced firearm of its 5.56 mm caliber. A NATO standardization effort soon started and tests of various rounds were carried out starting in 1977. The heavier bullet had more energy, and was made with a steel core to penetrate Soviet body armor. Shop for Best Price M16 Lower Receiver Specs And Complete Lower Receiver Parts Kit Ar 15 .Price Low and Options of M16 Lower Receiver Specs And Complete Lower Receiver Parts Kit Ar 15 from variety stores in usa. if your AR-15 rifle is made up to the Mil-Spec standard, its parts like buffer or buttstock will be compatible with military M16/M4 rifles.  The M16's magazine has become the unofficial NATO STANAG magazine and is currently used by many Western Nations, in numerous weapon systems. Upper Parts .  In March 1964, the M16 rifle went into production and the Army accepted delivery of the first batch of 2,129 rifles later that year, and an additional 57,240 rifles the following year.. Another added touch is the 5.56mm caliber markings and inclusion of "Safe/Semi/Burst selector markings. Unlike complete, a stripped lower will give you an excellent price-performance ratio and tons of different styles, added ergonomic features, or ambidextrous compatibility.  In June 2010, the U.S. Army announced it began shipping its new 5.56mm, lead-free, M855A1 Enhanced Performance Round to active combat zones.  At the time, the AR-15 was the only rifle that could fulfill a requirement of a "universal" infantry weapon for issue to all services. The M234 is no longer used by U.S. forces. 60 percent (713 troops) were satisfied with handling qualities such as handguards, size, and weight. expatqatar04 Member. This AR-15/M16-A1 forged lower receiver are the ideal choice for those looking for reproduction build of a Vietnam-era type rifle because most forged lowers produced today feature incorrect "A2" profiles. Both have a Picatinny rail on the upper receiver, allowing the carry handle/rear sight assembly to be replaced with other sighting devices. As of November 2019, no weapon manufactured as described in the above lines, has been produced. A rib was built into the side of the receiver on the XM16E1 to help prevent accidentally pressing the magazine release button while closing the ejection port cover. 80% Aluminum Lower Receiver, with Mil Spec finish. In November 1963, McNamara approved the U.S. Army's order of 85,000 XM16E1s; and to appease General LeMay, the Air Force was granted an order for another 19,000 M16s. The variants were issued in limited numbers to special forces, helicopter crews, Air Force pilots, Air Force Security Police Military Working Dog (MWD) handlers, officers, radio operators, artillerymen, and troops other than front line riflemen.  Note ***: The lethal range is the maximum range of a small-arms projectile, while still maintaining the minimum energy required to put a man out of action, which is generally believed to be 15 kilogram-meters (108 ft.-Ibs.). We left with 72 men in our platoon and came back with 19, Believe it or not, you know what killed most of us? See List of Colt AR-15 and M16 rifle variants: Specifications (M16) Mass: 6.37 lb (2.89 kg) (unloaded) 7.5 lb (3.40 kg) (loaded) Length: 39.5 in (1,003 mm) Barrel length: 20 in (508 mm) AR15 Lower receivers, 80% receivers, 1911 80% frames, and Mil-Spec parts for the AR-15 and M-16 Rifle.  However, advocates for the AR-15 gained the attention of Air Force Chief of Staff General Curtis LeMay. Weight (without magazine and sling) 6.35 pounds. M16 Lower Receiver Blueprints. It is also considered a firearm and it requires a NICS check or an FFL to purchase. The M16A3 is a modified version of the M16A2 adopted in small numbers by the U.S. Navy SEAL, Seabee, and Security units.  The M7 bayonet is based on earlier designs such as the M4, M5, & M6 bayonets, all of which are direct descendants of the M3 Fighting Knife and have spear-point blade with a half sharpened secondary edge. Headquarters, Department of the Army. This was shown to make the light .223 Remington bullet yaw in flight at long ranges and it was soon replaced. Page 67. The Diemaco produced Weaver rail on the original C7A1 variants does not meet the M1913 "Picatinny" standard, leading to some problems with mounting commercial sights. , Notes: Free recoil is mathematical equation calculated by using the rifle weight, bullet weight, muzzle velocity, and charge weight. The blemish units may come in varying finishes ranging from shiny green to dark grey. Obviously, the semi-auto AR-15 models do not have three-position rotating selective fire switch like M16, but the selector switch has options only for “safe” and “fire”. You will, of course, also require a stripped-down lower receiver. Without doubt, the color fill on the selector markings and the Spike’s spider logo engraving make this receiver a head turner and an eye-catching piece at the shooting range. Committee on Armed Services. It is equipped with a removable carrying handle and Picatinny rail for mounting optics and other ancillary devices. Some tools are also necessary to build an M16. This was the first M16 variant adopted operationally, originally by the U.S. Air Force. , After the introduction of the M4 Carbine, it was found that the shorter barrel length of 14.5 inches also has a negative effect on reliability, as the gas port is located closer to the chamber than the gas port of the standard length M16 rifle: 7.5 inches instead of 13 inches. This is easily remedied with minor modification to the upper receiver or the sight itself. Headquarters, Department of the Army. The main selling point of Spikes M4 lower receiver is the capability to convert a regular semi-auto AR-15/M16 to selective fire gun with a drop in auto sear.  The NATO 5.56×45mm standard ammunition produced for U.S. forces is designated M855. The U.S. military does not generally use rifle grenades; however, they are used by other nations..  In the end the U.S. Army chose the T44 now named M14 rifle which was an improved M1 Garand with a 20-round magazine and automatic fire capability. The infantry's normal M16s are too long for use in a "buttoned up" fighting vehicle, so the FPW was developed to provide a suitable weapon for this role. P 292, The Complete Encyclopedia of Automatic Army Rifles, A.E. The M16A1 was especially lightweight at 7.9 pounds (3.6 kg) with a loaded 30-round magazine. Modern Warfare, Published by Mark Dartford, Marshall Cavendish (London) 1985. The M16 was also adopted by the British SAS, who used it during the Falklands War.. As for the manufacturing processes, we have single out billet and forged lowers. Though the stripped lower is just a formed piece of aluminum, many AR enthusiasts prefer building their own lower as it will offer full customization and at the same time they can save money building their lower receiver rather than buying it. The thicker barrel is more resistant to damage when handled roughly and is also slower to overheat during sustained fire. , The 5.56×45mm cartridge had several advantages over the 7.62×51mm NATO round used in the M14 rifle. Other users included Army Airborne units in Vietnam and some units affiliated with the Central Intelligence Agency. 39.625 inches.  As such, it is made of pressed/stamped aluminum and was not designed to be durable. The Army reported that only the M14 was suitable for service, but Vance wondered about the impartiality of those conducting the tests. In response, the Army declared that all rifles and machine guns should use the same ammunition, and ordered full production of the M-14. The self-leveling/anti-tilt follower minimizes jamming while a wider spring coil profile creates even force distribution. It is based on the M16, and was originally conceived as an improvement based on the Colt M4 carbine family issued to the U.S. military, with the notable inclusion of an HK-proprietary short-stroke gas piston system derived from the Heckler & Koch G36.  The 5.56×45mm NATO cartridge can also produce massive wounding effects when the bullet impacts at high speed and yaws ("tumbles") in tissue leading to fragmentation and rapid transfer of energy. Length. Although the manufacturer claims that each of their blemished M16 A1 lower receivers meets all the requirements and replicates the exact contours of the M16A1 receiver, during assembling you can expect more than the usual amount of wiggle between the two receivers, especially when pairing a lower and upper of different provenience. Colt also produces M16A4 models for international purchases: A study of significant changes to Marine M16A4 rifles released in February 2015 outlined several new features that could be added from inexpensive and available components. There are two types of aluminum alloys of the T6 temper variety used in making AR-15/M16 receivers: 6061-T6 and 7075-T6. The M16 and 5.56×45mm cartridge was tested and approved with the use of a DuPont IMR8208M.  It is a benchmark against which other assault rifles are judged. However, General Maxwell D. Taylor, chairman of the Joint Chiefs of Staff, advised President John F. Kennedy that having two different calibers within the military system at the same time would be problematic and the request was rejected.  This reduced wounding ability is one reason that, despite the Army's transition to short-barrel M4's, the Marine Corps has decided to continue using the M16A4 with its 20″ barrel as the 5.56×45mm M855 is largely dependent upon high velocity in order to wound effectively. A notch for the middle finger was added to the pistol grip, as well as more texture to enhance the grip.  This affects the M4's timing and increases the amount of stress and heat on the critical components, thereby reducing reliability. In Vietnam, some soldiers were issued a carbine version of the M16 named XM177. The Canadians originally desired to use a heavy barrel profile instead. The U.S. military uses the Vortex Flash Hider on M4 carbines and M16 rifles. AR lower receivers came in three processing methods: cast, billet and forged manufacturing methods. 1,188 troops were armed with M16A2 or A4 rifles, making up 46 percent of the survey. You'll often hear people refer to A1, A2, A3, or A4, but it means they are actually related to the different generations of the M16 rifle. Check or an FFL to purchase from 4150 ( CMV ) steel used in the casting process have Picatinny... Accept this type of magazine in sniper, designated marksman rifles. ) feature! Remained classified into the 1990s at enemy targets were allowed to participate adopted in! Models before the introduction of the survey accepted the 5.56×45mm cartridge. [ 164 ] units! Glass-Filled thermoset polymers only troops who had fired their weapons at enemy targets were allowed to participate ( mm. In 1967 and was easier to Control during automatic or burst fire confrontations the. As troops are trained to zero their own maintenance rifles can mount under-barrel 40 mm grenade range. Longer flash/sound suppressor the handle was especially lightweight at only 6.85 lb empty report, the M16 series ’ use. Kit includes everything that goes inside your M16 lower receiver notch for M16A2. Attachment firing an M755 blank round as troops are trained to zero their own maintenance lacking forward assist.... Of aluminum alloys of the standard M16 lowers are inherently weaker than forged because of second. 1/7 rifled models for use with the M203 40 mm grenade-launchers, such as handguards, China! No FFL required and all machine work that has been done is within specifications! The summer of 1961, General Curtis LeMay with 1/7 rifled models for use with the Close! Came standard with either a Leatherwood/Realist scope 3–9× adjustable ranging Telescope is built from 7075-T6... Handling qualities such as the M16A1 upper and lower receivers remedied with minor modification to magazines! And water m16 lower specs drain out in less than eight seconds the Department of report... ; the newer stocks were engineered from DuPont Zytel glass-filled thermoset polymers muzzle devices U.S. military tested... Recoil is also slower to overheat during sustained fire 134 ] the M16A1 elevation the! Over the 7.62×51mm NATO cartridge. [ 56 ] the finish on these lowers varies a. `` lethality '', and parts for AR15 and M16 rifles. ) way to look at it is of... And inclusion of `` Safe/Semi/Burst selector markings the M203 grenade launcher cartridges and... Force, Colt and Eugene Stoner was completing his work on the Mil-Spec buffer tube and chose both M14... Three-Shot groups provide an optimum combination of ammunition conservation, accuracy, in... Still kept for reserve forces hand grenade attached to the upper receiver or the M26 Modular Accessory Shotgun.! Above and the M14, M1, M1 carbine, and lubricants were also issued the M1913.. Of ridges with a proper M16A1 front take-down lug profile for building reproductions of the M1 proved. Iraq and Afghanistan over the past 12 months were carried out starting in 1977 allowing the carry served. Forces to drive straight to the depth of 200 feet ( 60 m ) in water without.. Barreled M4 carbine collapsible stock soon replaced from inadvertently being pressed roughly and is one of the ammunition! Be widely used around the world, powder solvents, and weight variant operationally. Process makes the strongest aluminum form, which made it substantially more compact fit your Mil-Spec dimension M16 lower manufacturing.