

While serving to reduce the weapon's length, the rifled barrel of the weapon extends its total length to 89.9 centimetres (35.4 in). The rifle has a bullpup layout, with a detachable 36-round box magazine loaded behind the grip and trigger, with a safety switch located above the handle. The weapon is most commonly fired in the latter of these modes. The BR55 Service Rifle is a gas-operated, magazine-fed, mid-to-long range weapon capable of three fire modes semi-automatic, fully automatic, and a three-round burst-fire. 4 Non-canon and dubious canon appearances.It is notable for its powerful three-round burst fire and accurate 2× scope, making it more efficient at farther ranges than the MA5 series assault rifles. Among UNSC service personnel, the BR55 has accumulated a number of nicknames including the " Monkey Wrench", " BR", and the " Big Boy". The BR55 Service Rifle is an infantry battle rifle in service within the armed forces of the United Nations Space Command. " When nothing else gets the job done, the BR55 Battle Rifle will do." - Halo Encyclopedia: The Definitive Guide to the Halo Universe Short-stroke piston, rotating bolt, locked breech 9.5×40mm M634 Experimental High-Powered Semi-Armor-Piercing
