The Marine Corps is considering a change in service rifle from the M-16A2 to either the M-16A4 Rifle or the M-4 Carbine. Unfortunately, all three weapons suffer from a common shortcoming: the impotent 5.56-mm NATO cartridge. Merely changing weapons will not correct its deficiency in lethality.
It's the Cartridge, Stupid—Not the Rifle
By Major Anthony F. Milavic, U.S. Marine Corps (Retired)