M149 Magellan (Earth-5875)

The M149 Recoilless Rifle, better known as the M149 Magellan, was a limited UNSC weapon developed by the Office of Naval Intelligence's Watershed Division during the First Contact War.

Operational history
The only recorded use of the M149 Magellan was during the Battle of Algolis, where the UNSC Marine only known as Ghost took a prototype armor to battle against Covenant forces while he allowed the few Marine and civilian survivors to escape from Algolis. He later used the armor's M149 Magellan to destroy countless of Type-26 Banshees, one Type-52 Phantom and many Covenant soldiers.