Ordnance Notes -- by Bob Stoner GMCM (SW) Ret.
XM203 40mm Grenade Launcher
Aircraft Armaments, Inc. (AAI) was the other contractor in the grenade launcher race. AAI was also the prime contractor for the SPIW and they investigated may different grenade launcher concepts that used the 40mm grenade of the M79 and a smaller 30mm AAI design. Various launchers were tried: a disposable barrel, encapsulated grenade, a 3-shot manually operated launcher with either a straight line feed or rotary magazine, a 3-shot semi-automatic launcher, and a simple single-shot launcher whose barrel pulled forward to load.
The AAI design was standardized as the M203 40mm grenade launcher and has mostly replaced the M79 break-action launcher. The adoption of the M16 and M203 combination allowed the grenadier in the squad to carry a rifle comparable to his buddies and allowed him to dispense with the short-ranged pistol as his only other offensive weapon. The photo shows an M16A1 5.56mm rifle with the M203 40mm grenade launcher, the new hand guards which mount the battle sight for the M203, and the indirect fire sight (attached to the carrying handle of the rifle). The M203 can also be attached to the M16A2 5.56mm rifle and M4 5.56mm carbine. The M4 is the M16A2 rifle with a shortened barrel and telescoping butt stock similar to the XM177 series 5.56mm submachine guns. Today's SEAL grenadier may use either the M16A2 or the M4 with the M203 attached. Due to its size and weight, the M4/M203 combination is probably the preferred combination.
© 2005 Bob Stoner R4