M4A1 Destroyer

"We are now in this cold, dying, damned place. With Sesame Street under attack, this whole place is now being united to fight back against the Coalition of the Red Star invasion, conducted by the evil Lola Loud. Don't fool the world, because this new type of carbine is now part of the job for each Sesame Republic patriots."

--Su Ji-Hoon, Sesame Street Will Forever Be Free

The M4A1 Destroyer is an M4A1  with an attached grenade launcher. It is used as a weapon by the Sesame Republic Army.