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Wikipedia There is more information available on this subject at 7.62x51mm NATO on the English Wikipedia.
MA5B AR ammo

A 7.62x51mm from The Art of Halo 3.

The M118 7.62x51mm Full Metal Jacket Armor-Piercing (FMJ-AP) is a round used by the UNSC in the MA5 Series of assault rifles, the M247 General Purpose and AIE-486H Heavy Machine Guns, and several models of the DMR. Originally developed in the mid-20th century, it is used due to its reliability and heavy power.

As it is used with the MA5 rifles, which are one of the most common armaments in the Marine Corps, it is probably the most commonly fired and used round in the UNSC ground forces. It can be regularly found in packs littered around battlefields.

The round is effective against infantry, especially against unarmored or unshielded opponents. Energy shields drastically reduce the effectiveness of this round, but can still drain the shields after sustain fire. The round is also ineffective against vehicles, as it is not significantly armor-piercing. Massed fire from a squad of Marines, however, is enough to destroy or disable most vehicles short of tanks due to the sheer number of rounds fired. Thus, this is primarily an infantryman's round for use against other infantry.

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