Type Assault rifle
Place of origin United States
Used by Over 60 nations
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 x 45 mm NATO, 6.8 mm 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.
* 30 rounds (5.56 x 45 mm NATO)
* 26 rounds (6.8 mm Remington SPC)
Sights Adjustable front and rear iron sights
The M4 Type Carbine is a firearm manufactured by Bushmaster Firearms International, modeled on the AR-15 platform.
The M4 Type Carbine is effectively a reproduction of the Colt M4 Carbine, but is usually only semi-automatic for legality within the U.S. civilian market. However, it can be ordered by military or law enforcement organizations with three-round burst or fully-automatic capability. The rifle accepts both .223 Remington and 5.56 x 45 mm NATO cartridges, 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. It is compatible with most standard AR-15 parts, and has the ability to accept all AR15/M16 type STANAG magazines. It is also one of many different AR-15 rifles Bushmaster manufactures which they have trademarked 'XM-15' rifles.
Bushmaster has also developed a 6.8 mm Remington SPC version of the rifle, simply named the 6.8mm SPC Rifle, as well as a separate upper receiver kit that can be installed on any AR-15 type lower receiver.
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. Similarly, the 6.8mm SPC Rifle is available as either the A2 or the A3.
The standard M4 Type Carbine features a permanently fixed 'Izzy' flash suppressor attached to a 14.5" barrel which brings the barrel to a total length of 16". Bushmaster also produces the Patrolman's Carbine variant which features the more common removable 'Bird Cage' flash suppressor, attached to a 16" barrel bringing the total barrel length to 17.5". Both of these comply with current U.S. federal law which states a minimum of a 16" inch barrel for a semi-automatic rifle. There is also a military M4 Type Carbine which comes with a 14.5" barrel and a removable 'Bird Cage' flash suppressor. The 6.8mm SPC Rifle only comes with a 16" barrel and a removable 'Izzy' flash suppressor.
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 effectively been replaced by the M4A2 and M4A3. However, some states in the U.S. have kept these laws, so the rifle is still being produced.
The M4 carbine (or similar variants) is currently in service with military and police organizations of over 60 nations around the world.
Czech Republic: The Bushmaster M4A3 is used by special forces units of the Czech Armed Forces. These rifles are usually seen with an M203 grenade launcher.
New Zealand: In 2006, the Bushmaster M4 replaced the Remington Model 7600 as the Armed Offenders Squad of the New Zealand Police's standard issue rifle.