Carbine, 5.56 mm, M4
An M4 with an aftermarket buttstock, Rail Adapter System (RAS), flip-up rear sight, vertical forward grip with bipod and Aimpoint M68 CCO
Type Carbine Place of origin United States Service history In service 1994–present Used by See Users Wars Production history Manufacturer Colt Defense Produced 1994–present Variants M4A1, CQBR (Mk. 18 Mod 0) Specifications Weight 6.36 lb (2.88 kg) empty
6.9 lb (3.1 kg) with 30 rounds
Length 33 in (840 mm) (stock extended)
29.75 in (756 mm) (stock retracted)
Barrel length 14.5 in (370 mm) Cartridge 5.56x45mm NATO Action Gas-operated, rotating bolt Rate of fire 700–950 round/min cyclic Muzzle velocity 2900 ft/sec (884 m/sec) Effective range 500 m for a point target and 600 m for an area target Feed system 30 round box magazine or other STANAG Magazines. Sights Iron or various optics
The M4 carbine is a family of firearms tracing its lineage back to earlier carbine versions of the M16, all based on the original AR-15 designed by Eugene Stoner and made by ArmaLite. It is a shorter and lighter variant of the M16A2 assault rifle, with 80% parts commonality.
It is a gas-operated, air-cooled, magazine-fed, selective fire, shoulder-fired weapon with a telescoping stock. A shortened variant of the M16A2 rifle, the M4 has a 14.5 in (370 mm) barrel, allowing its user to better operate in close quarters combat. The M4 has selective fire options including semi-automatic and three-round burst (like the M16A4), while the M4A1 has the capability to fire fully automatic instead of three-round burst. The carbine is also capable of mounting an M203 grenade launcher, the M203A1 with a 9-inch barrel as opposed to the standard 12-inch barrel of the M203 used on the M16 series.
The M4 carbine is heavily used by the U.S military. It is slated to eventually replace the M16 rifle for most combat units in the United States Army. The winner of the Individual Carbine competition may replace the M4 carbine in U.S. Army service.
- 1 History
- 2 Design
- 3 Variants
- 4 Performance
- 5 Trademark issues
- 6 Users
- 7 References
- 8 External links
The M4 was intended to replace the .45 ACP M3 submachine guns and selected M9 pistols and M16 rifle series with most Army units (this plan was thought to be changed with the development of the XM29 OICW and the XM8 carbine; however, both projects were canceled.)
The United States Marine Corps has ordered its officers (up to the rank of lieutenant colonel) and Staff Non-commissioned officers to carry the M4 carbine instead of the M9 handgun. This is in keeping with the Marine Corps doctrine, "Every Marine a rifleman." United States Navy corpsmen E5 and below will also be issued M4s instead of the M9.
On July 1, 2009, the U.S. Army took complete ownership of the M4 design. This will allow companies besides Colt to compete with their own M4 designs. The Army planned on fielding the last of its M4 requirement in 2010. On October 30, 2009, Army weapons officials proposed a series of changes to the M4 to Congress. Requested changes include an electronic round counter that records the number of shots fired, a heavier barrel, and possibly replacing the direct impingement system with a gas piston system, the benefits of this, however, have come under scrutiny from both the military and civilian firearms community. It should also be pointed out that, according to a PDF detailing the M4 Carbine improvement plans released by PEO Soldier, the direct impingement system will only be replaced after reviews are done comparing the direct impingement system to commercial gas piston operating system to find out and use the best available operating system in the US Army's improved M4A1. 
As of September 2010 the Army has announced it will buy 12,000 M4A1s from Colt Firearms by the end of 2010 and will by early 2011 order 25,000 more M4A1s. The Army announced also to have open competition for the newly designed M4 bolt carrier and gas piston operation system, which will be fitted to the newly bought M4A1 carbines. The service branch plans to buy 12,000 of these conversion kits in early 2011. In late 2011 the Army plans to buy 65,000 more conversion kits. From there the Army will decide if it will upgrade all of its M4s.
The carbine variant of the XM8 rifle was canceled in 2005.
On November 13, 2008, the U.S. Army hosted an invitation-only Industry Day regarding a potential future replacement for the M4 carbine. Nineteen companies provided displays and briefings for military officials. The weapons displayed included the Barrett REC7 PDW, Bushmaster ACR, FN SCAR, Heckler & Koch HK416, Heckler & Koch XM8, LWRC M6A4, Robinson Arms XCR, SIG 556, as well as Colt's own improved version of the M4, the Colt ACC-M. The goal of the Industry Day was to provide officials with knowledge as to the current state of the art, which will assist the writing of a formal requirements document.
The possible successor to the M4 carbine in the U.S. Army is the Individual Carbine. This program is to provide a new carbine for the Army, while the USMC has decided to stay with the M4 for carbine use.
The M4 and its variants fire 5.56x45mm NATO ammunition (and .223 Remington ammunition) and are gas-operated, air-cooled, magazine-fed, selective fire firearms with either a multi-position telescoping stock or a fixed A2 or LE tactical stock. Original M4 models had a flat-ended telescoping stock, but newer models are now equipped with a redesigned telescoping stock that is slightly larger with curvature at the end. The M4 is similar to much earlier compact M16 versions, such as the 1960s-era XM177 family. Some of those visual designs are obvious in both weapons, however most of the similarities are not very noticeable.
As with many carbines, the M4 is handy and more convenient to carry than a full-length rifle. The price is slightly inferior ballistic performance compared to the full-size M16, with its nearly 6" (15 cm) longer barrel. This becomes most apparent at ranges of 300 yards and beyond. Statistically, however, most small-arms engagements occur within 100 yards. This means that the M4 is very much an adequate weapon for the majority of troops. The marginal sacrifice in terminal ballistics and range, in exchange for greatly improved handling characteristics, is usually thought to be a worthwhile compromise.
While the M4's maneuverability makes it a candidate for non-infantry troops (vehicle crews, clerks and staff officers), it also makes it ideal for close quarters battle (CQB). The M4 was developed and produced for the United States government by Colt Firearms, which had an exclusive contract to produce the M4 family of weapons through 2009; however, a number of other manufacturers offer M4-like firearms. The M4, along with the M16A4, have mostly replaced the M16A2 in the Army and Marines. The U.S. Air Force, for example, has transitioned completely to the M4 for Security Forces squadrons, while other armed personnel retain the M16A2. The US Navy uses M4A1s for Special Operations and by vehicle crews.
Some features of the M4 and M4A1 compared to a full-length M16-series rifle include:
- Compact size
- Shortened barrel 14.5 in (370 mm)
- Telescoping buttstock
However, there have been some criticisms of the carbine, such as lower muzzle velocities and louder report due to the shorter barrel, additional stress on parts because of the shorter gas system, and a tendency to overheat faster than the M16A2.
Like all the variants of the M16, the M4 and the M4A1 can be fitted with many accessories, such as night vision devices, suppressors, laser pointers, telescopic sights, bipods, either the M203 or M320 grenade launchers, the M26 MASS shotgun,forward hand grips and anything else compatible with a MIL-STD-1913 Picatinny rail.
Other common accessories include the AN/PEQ-2, Advanced Combat Optical Gunsight (ACOG), and M68 CCO. EOTech holographic weapon sights are part of the SOPMOD II package. Visible and IR (infrared) lights of various manufacturers are also commonly attached using various mounting methods. As with all versions of the M16, the M4 accepts a blank-firing attachment (BFA) for training purposes.
M4 feedramps are extended from the barrel extension into the upper receiver. This can help alleviate feeding problems which may occur as a result of the increased pressure of the shortened gas system of the M4. This problem is primarily seen in full-auto applications. While some feel they are unnecessary, their perceived or real utility to others has led to the increasing availability of this feature on civilian AR-15 products.
Except for the very first delivery order, all U.S. military-issue M4 and M4A1 carbines possess a flat-top NATO M1913-specification (Picatinny) rail on top of the receiver for attachment of optical sights and other aiming devices — Trijicon TA01 and TA31 Advanced Combat Optical Gunsights (ACOG), EOTech 550 series holographic sights, and Aimpoint M68 Close Combat Optic (M68 CCO) being the favorite choices — and a detachable rail-mounted carrying handle. Standards are the Colt Model 920 (M4) and 921 (M4A1).
Variants of the carbine built by different manufacturers are also in service with many other foreign special forces units, such as the Australian Special Air Service Regiment (SASR). While the SASR uses weapons of essentially the same pattern built by Colt for export (Colt uses different models to separate weapons for the U.S. military and those for commercial/export purposes), the British SAS uses a variant on the basic theme, the Colt Canada (formerly Diemaco) C8SFW.
The M4 carbine is slated to eventually replace the M16 rifle in the United States Army.
M4 MWS (Modular Weapon System)
Colt Model 925 carbines were tested fitted with the Knight's Armament Corporation (KAC) M4 RAS under the designation M4E2, but this designation appears to have been scrapped in favor of mounting this system to existing carbines without changing the designation. The U.S. Army Field Manual specifies for the Army that adding the Rail Adapter System (RAS) turns the weapon into the M4 MWS or Modular Weapon System.
The M4A1 carbine is a fully automatic variant of the basic M4 carbine intended for special operations use. The M4A1 has a "S-1-F" (safe/semi-automatic/fully automatic) trigger group, while the M4 has a "S-1-3" (safe/semi-automatic/3-round burst) trigger group. The M4A1 is used by almost all U.S special operation units including, but not limited to, the Army Rangers, Army Special Forces, Navy SEALs and Air Force Combat Control Teams. The M4A1 is especially favored by counter-terrorist and special forces units for close quarters combat because of the carbine's compactness and firepower. These features are also very useful in urban warfare. It has a maximum effective range of about 500 to 600 meters (550–660 yd).
All U.S. Army forces will begin replacing their basic M4 carbines and all 600,000 M16 rifles with the M4A1 variant in 2014. The M4A1 in turn would likely be replaced with the Individual Carbine. Replacement of the M16 would come from the Individual Carbine instead of the M4A1 if procurement was attained.
In the last few years, M4A1 carbines have been refit or received straight from factory with barrels with a thicker profile under the handguard. This is for a variety of reasons such as heat dissipation, which is useful due to the complaints of high-heat production from test soldiers, which occurs during full-auto and accuracy as a byproduct of barrel weight. These heavier barrel weapons are also fitted with a heavier buffer known as the H2. Out of three sliding weights inside the buffer, the H2 possesses two tungsten weights and one steel weight, versus the standard H buffer, which uses one tungsten weight and two steel weights. These weapons, known by Colt as the Model 921HB (for Heavy Barrel), have also been designated M4A1, and as far as the government is concerned the M4A1 represents both the 921 and 921HB.
Mark 18 CQBR
Current contractor for the Mark 18 is Colt & Lewis Machine & Tool NSN 1005-01-527-2288. It is equipped with a 10.3" barrel.
SOPMOD Block I
USSOCOM developed the Special Operations Peculiar Modification (SOPMOD) Block I kit for the carbines used by units under its jurisdiction. The kit features an M4A1, a Rail Interface System (RIS) handguard developed by Knight's Armament Company, a shortened quick-detachable M203 grenade launcher and leaf sight, a KAC sound suppressor, a KAC back-up rear sight, an Insight Technologies AN/PEQ-2A visible laser/infrared designator, along with Trijicon's ACOG and Reflex sights, and a night vision sight. This kit was designed to be configurable (modular) for various missions, and the kit is currently in service with special operations units.
SOPMOD Block II
A second-generation SOPMOD kit (now known as SOPMOD II) includes innovative optics, such as the Elcan Specter DR and the Eotech 553. Block II uses the RIS II rails manufactured by Daniel Defense in both a 9.5 and 12.5 length.
SOPMOD Block III
2012-XXXX SOPMOD 1 & 2 Compatible with both M4A1 Carbine & SCAR SOPMOD 2 Compatibilities with all SOF Weapons
2007 dust test
In the fall 2007, the Army tested the M4 against three other carbines in "sandstorm conditions" at Aberdeen Proving Ground, Maryland: the Heckler & Koch XM8, Fabrique Nationale de Herstal SOF Combat Assault Rifle (SCAR) and the Heckler & Koch HK416. Ten of each type of rifle were used to fire 6,000 rounds each, for a total of 60,000 rounds per rifle type. The M4 suffered far more stoppages than its competitors: 882 stoppages, 19 requiring an armorer to fix. The XM8 had the fewest stoppages, 116 minor stoppages and 11 major ones, followed by the FN SCAR with 226 stoppages and the HK416 with 233. The Army was quick to point out that even with 863 minor stoppages—termed "class one" stoppages which require 10 seconds or less to clear and "class two" stoppages which require more than ten seconds to clear—the M4 functioned well, with over 98 percent of the 60,000 total rounds firing without a problem. The Army said it planned to improve the M4 with a new cold-hammer-forged barrel to give longer life and more reliable magazines to reduce the stoppages. Magazine failures caused 239 of the M4's 882 failures. Army officials said the new magazines could be combat-ready by spring if testing went well.
Complicating the Army search for higher reliability in the M4 is a number of observations of M4 gas piston alternatives that suffer unintended design problems. The first is that many of the gas piston modifications for the M4 isolate the piston so that piston jams or related malfunction require the entire weapon be disassembled, such disassembly cannot be performed by the end user and requires a qualified armorer to perform out of field, where as any malfunction with the direct-impingement system can be fixed by the end user in field. The second is that gas piston alternatives use an off-axis operation of the piston that can introduce carrier tilt, whereby the bolt carrier fails to enter the buffer tube at a straight angle resulting in part wearing. The third is that the use of a sound suppressor results in hot gases entering the chamber, regardless of a direct-gas impingement or gas piston design choice. The gas-piston system also causes the firearm to become proprietary to the manufacturer, making modifications and changes with parts from other manufacturers difficult. The argument for a gas piston is that it would reduce fouling; the argument against is that is would increase weight and reduce accuracy. The issue remains contentious and unresolved.
Colt previously held a U.S. trademark on the term "M4". Many manufacturers have production firearms that are essentially identical to a military M4. Civilian models are sometimes colloquially referred to as "M4gery" ( //, a portmanteau of "M4" and "forgery"). Colt had maintained that it retains sole rights to the M4 name and design. Other manufacturers had long maintained that Colt had been overstating its rights, and that "M4" had now become a generic term for a shortened AR-15. In April 2004, Colt filed a lawsuit against Heckler & Koch and Bushmaster Firearms, claiming acts of trademark infringement, trade dress infringement, trademark dilution, false designation of origin, false advertising, patent infringement, unfair competition, and deceptive trade practices. Heckler & Koch later settled out of court, changing one product's name from "HK M4" to "HK416". However, on December 8, 2005, a District court judge in Maine granted a summary judgment in favor of Bushmaster Firearms, dismissing all of Colt's claims except for false advertising. On the latter claim, Colt could not recover monetary damages. The court also ruled that "M4" was now a generic name, and that Colt's trademark should be revoked.
- Afghanistan: Used only by Afghan Army commandos. M4s sold as part of a 2006 Foreign Military Sales package. Additional M4s sold as a 2008 Foreign Military Sales package.
- Australia: Used by the Special Operations Command, Clearance Divers. and Police Tactical Groups
- Bangladesh: Used by Bangladesh Paracommandos, Dhaka Metropolitan Police SWAT teams and Special Warfare Diving And Salvage
- Bahrain: M4A1s sold as a 2008 Foreign Military Sales package.
- Belize: M4s/M4A1s sold as part of a 2006 Foreign Military Sales package.
- Brazil: Used by Military Police of Rio de Janeiro State.
- Canada: C8 rifle.
- Czech Republic: The M4 Karabin A3 is used in small numbers by specialized units of the Czech Army. Known to be in use by the 601st Special Forces Group in 2006 to replace the Sa vz.58.
- Colombia: M4A1s as part of a 2008 Foreign Military Sales.
- Ecuador: M4s sold as a 2008 Foreign Military Sales package.
- El Salvador: M4s sold as part of a 2007 Foreign Military Sales package. Additional M4s sold as a 2008 Foreign Military Sales package.
- Georgia: Georgian Armed Forces.
- Greece: Used by EKAM.
- Hong Kong: M4A1 by Special Duties Unit of the Hong Kong Police Force
- Hungary: M4A1 SOPMOD by Hungarian Special Force 
- India: M4A1s as part of a 2008 Foreign Military Sales. M4A1 is also used by the Mizoram Armed Police, and Force One of the Mumbai Police.
- Indonesia: Used by Detachment 88 Counter-terrorism Police Squad operators. Also used by Komando Pasukan Katak (Kopaska) tactical diver group and Komando Pasukan Khusus (Kopassus) special forces group.
- Iraq: Used by the Iraqi Army. Main weapon of the Iraqi National Counter-Terrorism Force.
- Israel: Sold as part of a January 2001 Foreign Military Sales package to Israel.
- Italy: Only Special Forces
- Jamaica: M4s sold as part of a 2007 Foreign Military Sales package.
- Japan: M4A1s as part of a 2008 Foreign Military Sales package. M4A1 SOPMOD rifles are in use by the Japanese Special Forces Group.
- Jordan: M4s sold as part of a 2007 Foreign Military Sales package. Additionals M4s sold as a 2008 Foreign Military Sales package.
- Lebanon: M4 components being sold to Lebanese special forces. M4/M4A1s sold as a 2008 Foreign Military Sales package.
- Macedonia: M4s sold as a 2008 Foreign Military Sales package.
- Malaysia: Made under license by SME Ordnance Sdn Bhd. To be used by the Malaysian Armed Forces, special forces of Malaysian Maritime Enforcement Agency and Royal Malaysian Police.
- Nepal: Sold as part of a 2005 Foreign Military Sales package.
- New Zealand: Used by NZSAS operators and the police Armed Offenders Squad.
- Panama: M4A1s sold as a 2008 Foreign Military Sales package.
- Philippines: M4/M4A1s sold as a 2008 Foreign Military Sales package. Two variants of the M4 carbine are made by Floro International Corporation, consisting of the M4A1 5.56MM RIFLE and the M4A1 Model-C 5.56MM RIFLE.
- Poland: Used by Polish special forces unit Grupa Reagowania Operacyjno-Manewrowego (GROM).
- Portugal: Used by Marines special forces DAE (Destacamento de Acções Especiais).
- Serbia: Used by various police units.
- Singapore: Used by the Singapore Armed Forces Commando Formation.
- Taiwan: Used by National Police Agency (Republic of China) 
- Thailand: M4A1s sold as part of a 2006 Foreign Military Sales package.
- Tonga: M4/M4A1s sold as a 2008 Foreign Military Sales package.
- Turkey:Used by Special Forces
- United Arab Emirates: Purchased 2,500 M4 carbines in 1993.
- United States
- Yemen: M4s sold as part of a 2006 Foreign Military Sales package.
U.S. citizen ownership
Sales of select-fire or full automatic M4s by Colt are restricted to military and law enforcement agencies. Only under special circumstances can a private citizen own an M4 in a select-fire or fully automatic configuration. While many machine guns can be legally owned with a proper tax stamp from the Bureau of Alcohol, Tobacco, Firearms and Explosives, an amendment to the Firearm Owners Protection Act of 1986 barred the transfer to private citizens of machine guns made or registered in the U.S. after May 19, 1986. The only exception was for Special Occupational Taxpayers (SOT): licensed machine gun dealers with demonstration letters, manufacturers, and those dealing in exports and imports. As such, only the earliest Colt M4 prototypes built prior to May 19, 1986 would be legal to own by civilians not in the categories mentioned. However, US firearms law considers the lower receiver of a M16/M4 type rifle to be the "firearm" (the serial numbered and, in the case of machine guns, registered under federal law, part of the weapon). Therefore the more common registered Colt M16 may be configured as an M4 by replacing the M16 upper receiver/barrel assembly with an M4 upper half, and replacing the fixed rifle stock with a 4 or 6 position telescoping M4 stock.
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- ^ "Malaysia has licence to make M4 assault rifles". The Star. 2007-11-05. http://www.thestar.com.my/news/story.asp?file=/2007/11/5/nation/19381084&sec=nation. Retrieved 2010-03-22.
- ^ Thompson, Leroy (December 2008). "Malaysian Special Forces". Special Weapons. http://www.tactical-life.com/online/special-weapons/malaysian-special-forces. Retrieved 2009-12-17.
- ^ Daniel Watters. "The 5.56 X 45mm: 2005". http://www.thegunzone.com/556dw-15.html. Retrieved 2009-03-25.
- ^ "Unofficial New Zealand Special Air Service page". http://www.diggerhistory.info/pages-army-today/rar-sasr/nz-sas.htm. Retrieved 2009-03-25.
- ^ "Split second decisions: police rules of engagement". The Sunday Star-Times. 1 February 2009. http://www.stuff.co.nz/national/1387878. Retrieved 15 October 2011.
- ^ "M4A1 5.56MM RIFLE". Floro International Corporation. http://www.floro-intl.com/m4a1_556mm_rifle.html. Retrieved 2011-03-08.
- ^ "M4A1 Model-C 5.56MM RIFLE". Floro International Corporation. http://www.floro-intl.com/m4a1_modelc_556mm_rifle.html. Retrieved 2011-03-08.
- ^ Sebastian Miernik. "//- Strona poświęcona Wojskowej Formacji Specjalnej GROM -//". Grom.mil.pl. http://www.grom.mil.pl/uzbrojenie_pliki/UZBROJENIE.HTM. Retrieved 2010-08-30.
- ^ "Portugal – Destacamento de Ações Especiais (DAE)". Tropaselite.t35.com. http://tropaselite.t35.com/portugal-Marinha-DAE.htm. Retrieved 2010-08-30.
- ^ "Kalibar | Tekst". Kalibar.rs. http://www.kalibar.rs/code/navigate.php?Id=108&editionId=6&articleId=24. Retrieved 2010-08-30.
- ^ "Singapurske Specijalne Postrojbe" (in Croatian). Hrvatski Vojnik Magazine. http://www.hrvatski-vojnik.hr/hrvatski-vojnik/2122008/singapur.asp. Retrieved 2009-10-25.
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- ^ David Watters. "The 5.56 X 45mm: 2005". http://www.thegunzone.com/556dw-15.html. Retrieved 2010-03-10.
- ^ Daniel Watters. "The 5.56 X 45mm: 1990–1994". http://www.thegunzone.com/556dw-10.html. Retrieved 2009-03-25.
Current U.S. infantry weapons and cartridges
- Colt Official M4 Military page and Colt M4 Law Enforcement page
- US Army M4 fact file
- The AR-15/M16 Magazine FAQ
- U.S. Army Won't Field Rifle Deemed Superior to M4
- The USA's M4 Carbine Controversy
- Online Army Study Guide
Handguns Rifles Shotguns Submachine guns Machine guns Grenade launchers Mortars Rockets Missiles Cartridges
AR-10 • AR-15 • AR-57 • AR-831 • C7/C8 • CAR • CAR-15 • CM901 • Colt 9mm SMG • CQ • CQBR • GPC • HK416 • HK417 • LR300 • MSSR • M110 • M16 • M16K • M231 • M27 • M4 • M4A2/A3 • M6 • M468 • OA-93 • REC7 • Recon Rifle • SDM-R • SAM-R • Shrike • SOAR • SPR • SR-25 • SR-47 • SR-556 • T-14 • T-15 • T-16 • T-17 • T65 • T86 • T91
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Look at other dictionaries:
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