Big Cannon
The Big Cannon is the personal weapon of the Maximal commander Big Convoy. It is extremely powerful; only the likes of Magmatron could remain functional after even an indirect blast.
By inserting his Energon Matrix into the cannon, Big Convoy can transform it into the Matrix Buster. Fueled by this link to the supercomputer Vector Sigma, this weapon is so powerful, even a god might pause when faced with it.
Fiction
Beast Wars Neo cartoon
Big Convoy used the Matrix Buster to destroy Unicron. The Final Battle
Beast Wars Neo manga

Despite being told only do to reconnaissance on a Predacon space fortress, Big Convoy decided to disregard Crow Convoy's orders and rush into it, blowing it up with the Big Cannon. The 5 Rookies
When Big Convoy was busy fighting Magmatron with his hands, the mammoth nose on the Big Cannon pulled its trigger and blasted Magmatron several times, badly wounding him. Mortal Combat! Twenty Thousand Meters in the Sky
In a battle against the Predacons on the planet Jörmungandr, Big Convoy used the Big Cannon to blast Guiledart into pieces, angered that he had interrupted the duel between himself and Dead End by ordering Saberback fire on them. However, the Big Cannon was lost at the last moment when Big Convoy tried to save Break. It was sucked into space along with Saberback and several other Predacons. Later when heading back to Gung Ho, Big Convoy was trouble about why he chose to save Break and let his Big Cannon go, unaware of the growing bond between he and his trainees. Break thought it was his fault making Big Convoy loose the weapon.A Battle Fought Alone
Note
- According to the events in the story "Mortal Combat! Twenty Thousand Meters in the Sky" from the Beast Wars Neo manga, the Big Cannon seems to be a part of Big Convoy rather just a weapon. It might be like the relationship between Optimus Prime's components — Brain Center, Roller and Combat Deck.

