Did you read about the "Dread" system in the same article as...

Did you read about the "Dread" system in the same article as details about Metal storm for which the link was posted previously here by Adder?

http://modernmarinecorps.com/weapons-and-gear/future-firepower/

Similar concept to your idea Moosey, in a way, where
the grenades are slung out of an electrically operated circular track very quickly with no explosive propellant required - totally silent and with the capability to strike multiple targets all at once. Might be a competitor to larger variants of metal storm technology or maybe they could use MST's arming system?