If somebody's shooting at you, it seems like forever for the round to finally get there.
Proposed using a modern, US-made version of the Japanese Type 89 Grenade Projector ("Knee Mortar") which weighs 10 pounds, is fired from the prone, and is quite accurate out to 670 meters meters. It fires a one pound HE/steel warhead and reputedly accounted for a high proportion of our casualties during the Pacific War.
Imagine how great it would have been for engaging Hajis in Iraq and Afghanistan!
Proposed the idea years ago to the Marine Corps Lab and Dahlgren an I had two Type 89s for firing but while we were building US-safe projectiles, my project was shut down.
By the way, FN showed us a 40mm grenade launcher that fired the higher horsepower Mk19 rounds - beat the living crap out of those few of us who would try the thing out!
Bump