M4A1 M203 refers to the M4A1 carbine with M203 grenade launch attachment.
The M4A1 is used in the military as an alternative to the m16
by Anonymous August 3, 2003
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M4A1
A. DESCRIPTION: THE M4A1 IS A COMPACT LIGHTWEIGHT WEAPON THAT IS A MODIFIED M4 CARBINE. THE M4A1 (SOF VARIANT) CARBINE DIFFERS FROM THE BASIC M4 IN THE FOLLOWING FEATURES; FULL AUTOMATIC FIRING MODE, A FLAT TOP RAIL FOR MOUNTING DAY/NIGHT SIGHTS AND A DETACHABLE CARRYING HANDLE.

B. CAPABILITIES: THE M4A1 FIRES THE SAME AMMUNITION AS THE M16A2 AND THE M4 CARBINE. IT ALSO MOUNTS ALL ACCESSORIES COMMON TO THE M16A2 AND M4 TO INCLUDE THE 40MM GRENADE LAUNCHER. SOF UNITS WILL HAVE THE ABILITY TO ADAPT ONE VERSATILE WEAPON TO MEET SEVERAL MISSION NEEDS RATHER THAN HAVING MANY DIFFERENT WEAPONS THAT ARE CURRENTLY EMPLOYED.

M203-Features: The M203 40mm Grenade Launcher is used while attached to an M16A2 5.56mm rifle. It is a lightweight, compact, breech loading, pump action, single shot launcher. The launcher consists of a hand guard and sight assembly with an adjustable metallic folding, short-range blade sight assembly, and an aluminum receiver assembly which houses the barrel latch, barrel stop and firing mechanism. The launcher is capable of firing a variety of low velocity 40mm ammunition.
The launcher also has a quadrant sight which may be attached to the M16A2 carrying handle and is used when precision is required out to the maximum effective range of the weapon.
The m-4a1 m203 assault rifle is a versital weapon that increases the firepower of an individual soldier
by Shmerlin November 21, 2005
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Weapon. Used for killing people. Known as the M-4A1 M203 Assault Rifle by army weapons instructors and saddos who have probably never even held one, let alone fired one.
"Oh wow, is that an M-4A1 M203 Assault Rifle? I think I'm getting wood."
by Mr Cynicism September 25, 2005
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Proof that gun nuts can't spell (and probably shouldn't vote either).
Hyuk. I was just cleaning my m-4a1 m203 assualt rifle before I left to go vote Bush in the upcomin' election.
by -Gimpulse- June 19, 2006
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Tactical m4 with m203 grenade launcher, usually used for training young marines to getting used to shooting the m203.
The m4 usually doesn't have the m203 but can still be attached with one
by Mystrick August 7, 2003
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bt omega .68 cal 500 shot m4 semi with steel bearing9s for ammunition and a $13.99 canadian tire or equivalent steel tube tied with extra masks(bandannas) to the m4 with a pin that fires .12 Ga shotshells at roughly the same cyclic rate as a m203 attachment, especially with magnesium nuclear shotshells firing dragons breath or explosive tips(excluding hollowpoint slugs, slugs, buckshot, and birdshot)

needs no licences and lethal af. armor piercing and legal even in canada with a cyclic rate of 500 shots a minute with .68 steel balls, can be carried into gunfree zones by children usually in america if left in car cyclic rate of 10 shots maybe 15 a minute with the dragons breath or explosive tipped or tracers or aluminium explosive buckshot.

cop killer from canadian marijuana legalization efforts and my two belong in a museum i think im getting the license.
i think im going to get museum insurance on my uncontrolled m203.
by Cody5050 November 19, 2020
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bt omega .68 cal 500 shot m4 semi with steel bearing9s for ammunition and a $13.99 canadian tire or equivalent steel tube tied with extra masks(bandannas) to the m4 with a pin that fires .12 Ga shotshells at roughly the same cyclic rate as a m203 attachment, especially with magnesium nuclear shotshells firing dragons breath or explosive tips(excluding hollowpoint slugs, slugs, buckshot, and birdshot)

needs no licences and lethal af. armor piercing and legal even in canada with a cyclic rate of 500 shots a minute with .68 steel balls, can be carried into gunfree zones by children usually in america if left in car cyclic rate of 10 shots maybe 15 a minute with the dragons breath or explosive tipped or tracers or aluminium explosive buckshot.

cop killer from canadian marijuana legalization efforts and my two belong in a museum i think im getting the license.
i think im going to get museum insurance on my uncontrolled m203.
by Cody5050 November 19, 2020
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