Just made it to 194 with this build:
Ammo: Nuke
Stock: Reversal stock
Barrel: Quad barrel
Grip: Rubber grip
Mag: Spinshooter mag or smoker mag
Trigger: IDK but says it has an insane amount of fire rate and is full auto, but if you run the Spinshooter mag you can also run x5 burst mag if u want.