BR55 battle rifle

The 9.5x40mm Service Rifle, Mk.55, often referred to as the '''Mk. 55 battle rifle or even more commonly as the BR55''', was a high-caliber, selective-fire battle rifle which saw use in the UNSCDF as a special-issue infantry rifle throughout much of the Human-Covenant War. Hastily developed as a countermeasure to a threat that would never truly emerge, the BR55 seemed doomed to failure until the arrival of the in human space saw UNSC forces pitted against foes equipped with regenerating, against which the UNSC's standard  performed less than effectively. The unexpected success of the BR55 rifle would lead to the introduction of an improved version of the weapon, the, following the conclusion of humanity's cataclysmic war with the Covenant.