Must be damn close using Molotov cocktails, G.I on Rt has grenade launcher with the breech open on his Garandicon possibly not long fired a grenade.
If you single load the Garand with say the grenade cartridge does the action cycle and stay open or is that something you have to manually lock the bolt body back, ejecting the spent grenade cartridge.
As only gas has gone up the barrel so would the grenade enable enough back pressure to operate the action, just curious, not allowed to have semi auto rifles in our state.