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Weapons: The Case For Caseless
The U.S. Marine Corps and U.S. Army agree they may have finally found a caseless ammunition design that will work reliably in combat and be much (37 percent) lighter than conventional 5.56mm ammo.
The LSAT machine-gun weighs 4.27 kg (9.4 pounds) compared to 8 kg for the current M249. Moreover, the ammo for the new machine-gun is 37 percent lighter as well. Thus the new machine-gun, with 1,000 rounds of ammo, weighs 13.9 kg (30.6 pounds), which is 40 percent less than an M249 with a thousand rounds. Moreover, the new ammo takes up twelve percent less space.