M8C Grindell/Galilean Nonlinear Cannon

The  is a UNSC heavy weapon utilized in the post-war years. Its most prolific use is as the alternate primary armament of the D79H-TC/MA gunship.

History
Vehicle-mounted variants of the M6 G/GNR have been found on UNSC aerial vehicles since at least 2531, as the primary armament of the AV-22 Attack VTOL. The M8 entered service at some point after the war, and by mid-2557 the M8C model was regularly mounted on the Pelican gunship.

Specs
The M8C is presumably powered by a large Series 6971 battery, like its smaller cousin, the M6. It is at least three times as powerful as the portable variant, and is capable of downing Covenant Phantoms in just two hits. It is an extremely formidable anti-material weapon, and its blast radius is able to destroy multiple Wraiths in one hit. While its potency diminishes with distance, its beam is presumably lethal for a range of several miles.