7.62x51mm
From Halopedia, the Halo wiki
7.62x51mm M118 Full Metal Jacket Armor-Piercing[1] is a rifle cartridge commonly used in UNSCDF's MA5 Series of assault rifles.
Overview
The M118 FMJ-AP was originally developed by the NATO organization in the late 20th Century. Due to its reliability and heavy power, it is used with most common armaments in the UNSC Defense Force. It can be regularly found in packs littered around battlefields.
The following weapons are chambered with the M118 FMJ-AP:
- MA5 Series
- M392 and M395 Designated Marksman Rifle
- M739 Light Machine Gun
- M247 General Purpose Machine Gun and M247T Medium Machine Gun
Performance
The round is effective against infantry, especially against unarmored or unshielded opponents. Energy shields drastically reduce the effectiveness of this round, as it does not have enough kinetic energy to significantly drain the shields. The round is also largely ineffective against vehicles, as it is not significantly armor-piercing. Massed fire from a squad of Marines, however, is enough to drain shields and 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.
Real world background
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There is more information available on this subject at 7.62x51 NATO on the English Wikipedia. |
The 7.62x51mm NATO was originally developed by NATO, a military alliance between national governments, in the middle of the 20th century. It was developed to be reliable when used in fully automatic weapons, to have a large punch, and to standardize service rifle calibers between governments, in order to improve logistics. It replaced a variety of smaller ammunition and largely achieved the goals of development.
It is a full-power rifle round in the 20th century, and is fairly common in machine guns, battle rifles, and sniper rifles, but not in lightweight assault rifles due to recoil and the size of 7.62x51mm NATO weapons; they are usually larger and heavier to accommodate the longer, more powerful cartridge. Its ineffectiveness in individual infantry weapons led to the adoption of the 5.56x45mm NATO round, due to better controllability and the ability to fit it into small, lightweight assault rifles.
It is not known why the 5.56x45mm NATO round disappears in the Halo universe, but it could be possible that weapons technology advanced so much as to fit enough recoil control systems on a firearm to allow this powerful round be used as an infantry rifle round (the same could apply to the M6 series). It also seems that in the Halo universe, the 7.62x51mm round is no longer considered a full-power rifle cartridge, explaining why weapons that use the round such as the MA5 series are considered assault rifles when they would be considered battle rifles by today's standards. However, certain rifles such as the DMRs still use the 7.62x51mm round to great effect, presumably by having an extremely high muzzle velocity.
Gallery
Closeup of an M118 FMJ-AP cartridge in an MA5D's magazine in Halo 4.
- NATO 7 62x51.jpg
An actual 7.62x51mm NATO rounds, with a ruler and AA battery for scale.
List of appearances
Sources
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