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 02, 2003

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Top Definition
The M4 is light and more durable than the m-16 but is a smaller version.

Caliber: 5.56mm NATO
Action: Gas operated, rotating bolt
Overall length: 838 mm (stock extended); 757 mm (stock fully collapsed)
Barrel length: 370 mm
Weight: 2.52 kg without magazine; 3.0 kg with magazine loaded with 30 rounds
Rate of fire: 700 - 950 rounds per minute
Maximum effective range: 360 m


by Lancer Fox July 30, 2003

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The M4/M4A1 5.56mm Carbine is a lightweight, gas operated, air cooled, magazine fed, selective rate, shoulder fired weapon with a collapsible stock. A shortened variant of the M16A2 rifle, the M4 provides the individual soldier operating in close quarters the capability to engage targets at extended range with accurate, lethal fire. The M4 Carbine achieves over 80% commonality with the M16A2 Rifle.

The m-4a1 m203 assualt rifle is similar in design and functioning to the M16 family of rifles. Compared to the M16A2 rifle, the M4 Carbine is 1.3 pounds lighter, 6 5/8 inches shorter with buttstock extended, and almost 10 inches shorter with the buttstock collapsed.
by bob909 September 14, 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 06, 2003

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