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Bushmaster M4-type carbine
Bushmaster XM15-E2S M4 with magazines
Type Carbine rifle (semi-automatic or select fire)
Place of origin United States
Service history
Used by Over 60 nations[1]
Wars War in Afghanistan (2001–present)
War in Iraq (2003-2010)
War in South Ossetia (2008)
Production history
Manufacturer Bushmaster Firearms International
Variants M4A2, M4A3, M4 Post-Ban
Weight 2.82 kg (6.22 lb) empty
Length 882.7 mm (34.75 in) (stock extended)
Barrel length 406.4 mm (16 in)

Cartridge .223 Remington
5.56×45mm NATO
6.8mm Remington SPC
Action Gas-operated, rotating bolt
Rate of fire Semi-automatic
(700–950 round/min for fully automatic model)
Feed system Various STANAG magazines.
Standard with:
  • 30 rounds (5.56×45mm NATO)
  • 26 rounds (6.8mm Remington SPC)
  • 26 rounds (7.62×39mm)
Sights Adjustable front and rear iron sights

The Bushmaster M4 is a semi-automatic carbine manufactured by Bushmaster Firearms International, modeled on the AR-15 platform. It is one of the Bushmaster XM15 line of rifles and carbines.[2]


The M4 Type Carbine is a variant of the Colt M4 carbine. It is only sold as a semi-automatic for the U.S. civilian market in compliance with the National Firearms Act. It can be ordered by military or law enforcement organizations with three-round burst or fully automatic capability.[3]

The rifle's caliber is .223 Remington/5.56×45mm NATO, and the barrel is hard chrome lined in both the bore and chamber. Unlike the current Colt M4 Carbine which features a 4-position telescopic stock, the Bushmaster has a 6-position stock. It is compatible with most standard AR-15 parts, and has the ability to accept all AR-15/M16 type STANAG magazines.

All variants of the rifle are available in either M4A2 and M4A3 configurations; the difference being the M4A3 has a removable carry handle allowing access to a Picatinny rail for mounting accessories.

The standard M4 Type Carbine features a permanently fixed "Izzy" flash suppressor attached to a 14.5 in (370 mm) barrel which brings the barrel to a total length of 16 in (410 mm). Bushmaster also produces the Patrolman's Carbine variant which features the more common removable "bird cage" flash suppressor, attached to a 16 in (410 mm) barrel bringing the total barrel length to 17.5 in (440 mm). Both of these comply with current U.S. federal law which states a minimum 16 in (410 mm) barrel for a rifle. There is also a military M4 Type Carbine which comes with a 14.5 in (370 mm) barrel and a removable "bird cage" flash suppressor.[3] The 6.8mm SPC Rifle only comes with a 16 in (410 mm) barrel and a removable "Izzy" flash suppressor.[4]

An M4 Type Post-Ban Carbine was developed for the 1994 United States Federal Assault Weapons Ban requirements. Since the ban expired in 2004, this rifle has essentially been replaced by the M4A2 and M4A3. Some states in the U.S. have kept these laws, so the rifle is still being produced.

Legal issuesEdit

A trademark dispute between Bushmaster and Colt concerned the use of the "M4" name. The M4 was developed and produced for the United States government by Colt, which had an exclusive contract to produce the M4 family of weapons through 2009.[5] Several other manufacturers, including Bushmaster, offer M4-like firearms. Colt previously held a U.S. trademark on the term "M4."[6] In April 2004, Colt filed a lawsuit against Bushmaster and Heckler & Koch, 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. 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.[7]

A Bushmaster XM15-E2S carbine was used by Adam Lanza to kill 26 victims during the Sandy Hook Elementary School shooting.[8] Plaintiffs representing victims of the crime filed a class action suit in Connecticut against Remington Arms and others citing an exception clause in the 2005 Protection of Lawful Commerce in Arms Act.[9][10] The plaintiffs allege that the Bushmaster XM15-E2S is only suitable for military and policing applications, and Bushmaster inappropriately marketed the firearm to civilians.[10] On April 14, 2016 a Connecticut court denied the defendants motion to dismiss.[11]

Related modelsEdit

Bushmaster has also developed a 6.8mm Remington SPC and a 7.62×39mm version of the rifle, simply named the 6.8mm SPC Rifle and the 7.62×39mm Carbine respectively, as well as a separate upper receiver kit that can be installed on any AR-15 type lower receiver.[4] It is available as either the A2 or the A3.

Military usersEdit

Czech ISAF (6)

A Czech special operations soldier in Afghanistan with the M4A3.

Bushmaster weapons are currently in service with military and police organizations in over 60 nations around the world.[1]

See alsoEdit


  1. 1.0 1.1 "Bushmaster around the world". Bushmaster Firearms International. 2007. Archived from the original on September 27, 2007. Retrieved 2007-09-06. 
  2. "Bushmaster User Manuals & Tech Sheets". Bushmaster Firearms International. 2007. Retrieved 2007-09-06. 
  3. 3.0 3.1 "Bushmaster military models - Bushmaster M4 A2/A3 Type Carbines". Bushmaster Firearms International. 2007. Retrieved 2007-09-06. [dead link]
  4. 4.0 4.1 "Bushmaster 6.8mm SPC Rifle Tech Sheet PDF" (PDF). Bushmaster Firearms International. June 2006. Retrieved 2007-09-06. 
  5. Terrill, Daniel (12 August 2015). "Remington sues gov’t over Army’s contract with FN, Colt". Retrieved 14 April 2016. 
  6. US Trademark serial number 76335060 registration number 2734001
  7. "OpenJurist synopsis of denial of Colt's appeal to 08 Dec 2005 ruling". Retrieved 2010-08-30. 
  8. Lysiak, Matthew (23 Feb 2016). "Video of Adam Lanza Confirmed as Newtown Parents Sue". Newsweek. Newsweek LLC. Retrieved 23 February 2016. 
  9. Terrill, Daniel. "Remington tries for dismissal in Sandy Hook, Bushmaster case". Retrieved 23 February 2016. 
  10. 10.0 10.1 Obbie, Mark (17 Feb 2016). "Will a Gun Manufacturer Be Held Liable for Sandy Hook?". The Atlantic. The Atlantic Monthly Group. Retrieved 23 February 2016. 
  11. Gorman, Michele (14 April 2016). "Sandy Hook Lawsuit: Judge Rules Against Gun Companies". Newsweek. Newsweek LLC. Retrieved 14 April 2016. 
  13. "601st Special Forces Group Official Website". Retrieved 2015-09-26. 
  14. "Georgian Army". Georgian Army. Retrieved 2007-06-25. 
  15. Royal Malaysian Customs Academy (2010). "Royal Malaysian Customs Academy: Firing range". Royal Malaysian Customs. Retrieved 2016-03-20. 
  16. "Replacement due for police rifles". New Zealand Police. 2005-05-19. Archived from the original on 2007-11-01. Retrieved 2007-06-25. 
  17. "건파워 통합 게시판 - "해양경찰특공대 저격수 훈련" Update 2007/02/22". Retrieved 2015-09-26. 

External linksEdit

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