The Baby Magnum from Heavy Object. The "Baby Magnum Full" is the original design; the "Baby Magnum Separated" is the version with the guns separated so they print better.
Class: 1st Generation Composite Battlefield Suppression Weapon
Main Armament: 7 Composite Rotary Cannons
Secondary Armament: 8 Secondary Laser/Beam Cannons; 98 Tertiary Coil/Railguns