| Caliber | 40x46 mm grenade |
| Firearm action | Single-shot, Single action |
| Barrel length | 12 in (305 mm) |
| Overall length w/M16 | 39 in (990 mm) |
| Effective range | 160 yd (150 m) |
| Maximum range | 1,312 ft (400 m) |
| Rate of fire | 5 to 7 round/min |
| Muzzle velocity | 250 ft/s (76 m/s) |
| Weight, launcher (unloaded) | 3 lb (1.36 kg) |
| Weight, launcher (loaded) | 3.5 lb (1.6 kg) |
| Weight w/M16 (loaded) | 11 lb (5.0 kg) |
M203 generally refers to the United States Army designation for a single shot 40 mm grenade launcher that attaches to the M16 assault rifle or the M4 Carbine. Stand-alone variants exist as do versions capable of being used on many other rifles. The device attaches under the barrel and forward of the magazine, the trigger for it being just forward of the magazine. The magazine functions as a handle of sorts when firing for the M203. A separate sighting system is added to rifles with the M203 as the rifle's regular sights are not matched to the launcher. The M203 can fire high-explosive, smoke, illuminating, buckshot direct fire, CS gas, and training grenades.
It is sometimes thought that the M203 was a poor replacement for the M79, as while the M79 was quick to reload and more or less accurate under adverse conditions, such as in Vietnam War, the M203 was more difficult to operate, and could be sent off-target more easily by variables such as a gust of wind.
A new grenade launcher in development, the XM320, will likely replace the 203 in United States service eventually. The XM320 weighs more than the M203, but has some added benefits.
The 40 mm grenades used in the M203 are not the same as in the Mk 19 grenade launcher, which are of higher power.
The standard M203 is intended for permanent (armorer level) attachment to the M16A1, M16A2 and M16A3 rifles, and utilizes a 12" rifled barrel. These can also be attached to M4 and M4A1 carbines, using a different front attachment point forward of the front sight block, but the SOPMOD kit uses M203A1 grenade launchers.
The M203A1 is intended for use with the M4 and M4A1 Carbine. The barrel is shortened to 9", and principally the M203A1 QD is able to quickly detach from the rifle, and be replaced by a Knight's Armament Company M4 RAS lower handguard. An advantage of using a 40 mm grenade launcher on an assault rifle equipped with MIL-STD 1913 Rails is the attachment of various range-finding optics.
The M203A2 is intended for use with the M16A4 MWS (Modular weapon system). Using standard 12" barrels, the grenade launcher is intended for use in concert with the Knight's Armament Company M5 RAS. Again, an advantage of this system is the attachment of range-finding optics makes precision targeting easier.
The M203 Pi system is used for attachment of the M203 to other rifles, including but not limited to the Steyr AUG, H&K G3 and other rifles. Most of these other companies have since devised 40 mm grenade launchers custom integrated with the weapon.
Note: some data differs for versions that attaches to M4 Carbine
The M203 is known to the common man as "the shorter, larger gun under the M16 and M4" and has been used to defeat "bigger or tougher foes" in most films, TV series and video games. As with the M16 rifle, M4 carbine, M249 SAW and M9 pistol, the M203 is a hallmark of the modern American soldier.
Grenade launchers | Modern artillery of the United States | 40 mm artillery
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