The M203 is furnished with a battle sight mounted on the handguard graduated for 50-250 meters. A quadrant sight graduated for 50-400 meters mounts on the upper receiver.

The barrel slides forward in the receiver to accept a round of ammunition, and slides rearward to automatically lock in the closed position, ready to fire.

- Each M203 is furnished with a special handguard. A battle sight adjustable for ranges of 50 to 250 meters is mounted on the handguard. A quadrant sight, which mounts on the carrying handle and is adjustable for 50 to 400 meters, is also furnished with each launcher.

- The M203 attaches directly to any standard Colt M4 Carbine and M16A2/A4 Rifle providing the grenadier with a combined launcher and individual weapon. Mounting can be accomplished by utilizing either an optional quick detacher or only two screws, and without any modification to the weapon.

- Installation can be accomplished very quickly without using any special tools.

- The M203 will fire a wide variety of ammunition, such as high explosive antipersonnel and armor piercing dual purpose rounds. Colt’s M203 Grenade Launcher also is being used as the delivery system for a growing array of less-than-lethal munitions.

- Complete self-cocking firing mechanism is included in the receiver, allowing the M203 to be operated as an independent weapon, even though attached to the Colt M4 Carbine or M16A2/A4 Rifle.