It's a Trial of Position, a 3/5 mover, and can probably expect (given average movement modifiers and range) about 40 points per turn. It's good in a standard game, but this is essentially an arena fight, and I would favour canon dueling machines to tear it apart.
That was expected damage on 7s to hit. Even with a base gunnery of 2, medium range, attacker movement modifier, target movement modifier, and the cluster chart along with minor heat issues add up.