Editing M634 Experimental High-Powered Semi-Armor-Piercing

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''9.5x40mm'' '''M634 Experimental High-Powered Semi-Armor-Piercing''' (abbreviated '''M634 X-HP-SAP''') ammunition is a type of [[United Nations Space Command]] .374-caliber rifle projectile that is made specifically for the [[UNSC]] [[Battle Rifle|BR55 Battle Rifle series]].
==Introduction==
Introduced along with the BR55 [[Battle Rifle]] as an improvement over the standard 7.62x51mm [[assault rifle|assault rifles]] in the [[UNSC]]'s inventory, this intermediate round provides good accuracy, controllability, and effectiveness against most [[Covenant]] personnel. Unlike most ammunition types in the Halo games, this is not a real-life [[ammo]] type.

==Physics==
The 9.5mm cartridge's performance is consistent with other special-purpose rifle calibers, offering high power and accuracy in close-combat engagements. In a rifle weighing anywhere between 8.5 to 11 pounds, this would produce manageable felt recoil that could be placed somewhere between that of the modern-day AK-47 and a full-power rifle such as the FN FAL, with a muzzle energy of around 3,200 joules, although it is only an estimation based on the width of the cartridge and how many rounds it takes to kill an opponent. 

The 9.5x40mm cartridge is used in standard 36-round magazines for the BR55, providing the shooter with twelve bursts before a reload is required. Though fire selection is disabled in game, for simplicity of gameplay and balance, in the Halo Shorts, the BR55 is capable of fully automatic fire.

The only weapon that uses this caliber cartridge is the BR55 [[Battle Rifle]], which first appeared in [[Halo 2]] and returned in [[Halo 3]]. The fact that the Battle Rifle does much more damage than the original Assault Rifle could have to do with the higher knockdown power and kinetic energy transfer effect of the larger projectiles.

Overall, the 9.5mm x 40 Experimental Armor-Piercing round is an excellent medium-range intermediate cartridge, providing comparable effectiveness to the antiquated Russian 9x39mm round. The 9x39mm SP-5 and SP-6 subsonic armor piercing cartridges, which were developed for a series of special purpose sniper rifles and compact assault rifles, are also similar in use to the 9.5x40mm cartridge in the BR55. In many ways, the Battle Rifle is more of a true Assault Rifle than the MA5x-series, as its shorter, more controllable cartridge provides it with a great deal of accuracy and effectiveness against armored and energy-shielded foes in a wide variety of situations.

==Related Pages==
{{UNSC Infantry Weapons}}

[[Category:Ammunition]]