/vr/ - Retro Games

>>6580647
Regular NATO ballistic grenades are 40x46mm (40x53mm for the high pressure long range ones meant for grenade machineguns), so that thing probably carries a pretty decent payload.
With the name suggesting rocket propulsion, I figure it's intended for some sort of rapid fire rocket launcher that puts out lots of explosive ordnance at once.

For reference, here's an actual rocket propelled 40mm explosive munition, the Raytheon Pike, made to be fired from regular 40mm grenade launchers (which can fit them, anyway).