[DCBryan1]

The new grenade launcher story. What size was the grenade?
Sounds like a coer story to me.

Possibly they took some 40mm Mk19 automatic grenade launcher ammo (which is hotter) and tried to shoot them through the M203 tube which is slung under the barrel of the M16.

[Fred Mertz]

I'm familiar with the M 203 but not very familiar with the MK 19. I'll have to do some research later on that.

[HoustonCurmudgeon]

Possibly they took some 40mm Mk19 automatic grenade launcher ammo (which is hotter) and tried to shoot them through the M203 tube which is slung under the barrel of the M16.

I suspect,(this is a wild ass guess Fred), that a bunch of gung ho marines (God Bless them though He didn't make them smart enough to get in the ARMY) found some Russian (or the Iraqi knock off)made RPG and before destroying the lot wanted to test fire a couple of them. I do not believe anything new and low tech would be sent to combat troops involved in a short time war.

[The KG9 Kid]

"... Possibly they took some 40mm Mk19 automatic grenade launcher ammo (which is hotter) and tried to shoot them through the M203 tube which is slung under the barrel of the M16."

That will actually work once. It's already happened in the past without these kinds of fatalities.

I believe that this is the laser-range/fused 25mm HVEL grenades they might have had a disaster with.