America's lean, mean fighting machine may get a bit more lean in the coming years when it comes to ammunition. The Marine Corps is close to picking up a new polymer ammo for its tried-and-true M2 Browning .50 caliber machine gun to lighten the load for grunts downrange.

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The Scalable Offensive Hand Grenade (SOHG) can be combined for bigger explosions. One base grenade provides a "high pressure stun" effect, two stacked grenades can kill people, and three can destroy structures. (Nammo)

From flying tilt-rotor MV-22 Ospreys into combat to training with robot battle buddies, the Marine Corps has a history of pioneering unconventional technology and ideas for the American warfighter.

But one new weapon the Corps is looking into could really blow up big: a new, stackable hand grenade that could be used as a stun weapon, a lethal explosive, or even as an ad hoc breaching charge.

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