@The Survivor
I took a look, and you seem to already have the M61 Vulcan. It's a respectable weapon, and the rounds it fires are already pretty big. The big blue round shown here is the 20x102mm round, next to some .50 BMG rounds and a stick of computer RAM for size.
But if you want to go bigger, The only thing that's really bigger than that is the GAU-8 Avenger. Which is mounted on aircraft like the A-10 Warthog. It uses 30x173mm rounds. to some Pretty nasty effect.
Yes, exactly what I was looking for. Considering my character's Valk Suit is 135 feet tall, I wanted the main gatling gun to be something special. Thank you.
I'm not a huge gun guy, but joining this RP has really gotten me to appreciate weaponry, at least on vehicles.