Top Definition
The widely known Assault Rifle of the halo books.

A cut-down version of the standard-issue MA5B assault rifle. It's tough and reliable, with electronic targeting and an ammo supply indicator. It also has a recoil-reduction system, and could deliver an impressive fifteen rounds per second.

It is not seen in the Halo video games, but is described in the Halo books such as: Halo: The Fall of Reach, Halo: First Strike, Halo: The Flood, and Halo: The Ghosts of Onyx.
John chose the MA2B as the right weapon for the mission.

Whilst Linda chose the SRS99C-92 sniper rifle.
by That Halo Guy August 10, 2009
5 Words related to MA2B

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