M634 Experimental High-Powered Semi-Armor-Piercing: Difference between revisions

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[[File:Ammo_-BR.png|thumb|150px|A M634 9.5x40mm KURZ from ''[[The Art of Halo 3]]''.]]

'''M634 Experimental High-Powered Semi-Armor-Piercing''' (abbreviated '''M634 X-HP-SAP''') ammunition is a type of rifle projectile that is made specifically for the [[Battle Rifle|BR55 Battle Rifle series]]. Its metric dimensions are 9.5x40mm, compared to the [[M118 7.62x51mm Full Metal Jacket Armor-Piercing]] [[rounds]] used in the [[MA5 Series]] of UNSC assault rifles. It was introduced into the [[UNSC Marine Corps]] along with the [[BR55 Battle Rifle]].

== Overview ==

In combination with the BR55 Battle Rifle, this round is accurate enough that the 2x scope on the Battle Rifle is useful. Even when fired in three-shot bursts, the round produces little recoil resulting in very little muzzle lift. It is more effective against both shielded and unshielded [[Covenant]] personnel than the 7.62x51mm NATO, as the increased accuracy leads to an increased number of headshots and the increased kinetic energy of the round leads to faster shield depletion and increased damage to unshielded enemies. It has been shown that a [[BR55 Battle Rifle]] with M634 ammunition does enough damage to kill an opponent faster than an [[MA5C Assault Rifle]] using M118 7.62x51mm Full Metal Jacket Armor-Piercing ammunition. Overall, the M634 Experimental High-Powered Semi-Armor-Piercing round provides good accuracy, controllability, and effectiveness against all personnel.

However, while the M634 X-HP-SAP does do more damage than the 7.62x51mm NATO against vehicles, it is still not a very effective round at damaging or stopping vehicles.

== Properties ==

As designated in its name, the M634 X-HP-SAP is an experimental round. It uses a special propellant that allows it to achieve a higher muzzle velocity than the [[7.62x51mm NATO]] while using a smaller cartridge. It is also semi-armor-piercing, meaning that it mixes the properties of an [[Armor Piercing Rounds|armor-piercing round]] with the properties of another type of round. The second type is unknown, though it is most likely similar to the [[M225 Semi-Armor-Piercing High-Explosive]] used in the [[M6 Series]].

 

Unlike most ammunition types in the Halo games, this is not a real-life ammo type, the closest comparison being the [[wikipedia:9x39mm|9x39mm]] special purpose round. Designed in the Soviet Union, this round was designed to defeat body armor at ranges closer than 100 meters, and be subsonic, so it can be easily used in suppressed firearms. In fact, most weapons firing it have an ''integrated'' silencer. The M634 is likely the result of the human inclinations towards bigger things (leading to the 9.5 mm bullet) and technological manipulation (leading to the experimental propellant). It's also possible the large caliber, while overkill by current standards, is required to defeat the advanced body armour of the Insurrectionists and later the Covenant.