The M203A1 is a 40mm, single shot, breech loaded, pump action, shoulder fired grenade launcher. It is used by both American and Canadian forces. It is mounted under the barrel. It ranges from 100-400m adjustable in 50m increments. The most commonly used rounds are smoke, CS, and HE rounds. It weighs 1.3kg unloaded and 1.8kg loaded depending on the round. It is simple to operate, take apart, and clean.
The M203 Grenadier took out a trench from 350m.
by Brendan September 29, 2004
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A nubby grenade weapon slung to the underneath of an M4 rifle on the (somewhat)popular online game Soldier Of Fortune 2.

Incredibaly fustrating to be killed by it.
Me: fo m203 nub
Him: lol rofl, owned
by AK God January 01, 2004
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A singular pump action single fire grenade launcher. Fires 40mm high explosive shells. Little kids know this thing as the noob tube.
IRL: "Private! Cover our men using the M203.
C.o.D: "Aww that idiot noobtubed me!"
by Charles Keif February 10, 2014
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The thing under the barrel of Tony Montana's M16A2 that shoots grenades.
-Tony Montana as he blows open the door with his M16A2 with M203.
by Tony Scarface Montana September 13, 2008
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A grenade launcher usually attached to the bottom of an M-16 or M4 assault rifle. More commonly known to Soldier of Fortune 2 players as the n00b cannon due to the fact it is easy to use and can frag a player in one shot, hence it is a favourite among n00bs.
Shiiiiiit! I just got fragged by that n00b and his M203 n00b cannon.
by Anon. January 11, 2004
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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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