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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.
m203 by Brendan September 29, 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!"
M203 by Charles Keif February 10, 2014
The thing under the barrel of Tony Montana's M16A2 that shoots grenades.
"SAY HELLO TO MY LITTLE FRIEND!!!"
-Tony Montana as he blows open the door with his M16A2 with M203.
M203 by Tony Scarface Montana October 24, 2008
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.
M203 by Anon. January 11, 2004
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
m203 by AK God January 1, 2004
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.
m203 by Cody5050 November 18, 2020
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.
m203 by Cody5050 November 18, 2020