The guns from DOOM Eternal would be great on ArcCW, probably with Gunsmith Offensive. The Combat Shotgun, the Chaingun, Rocket Launcher, Plasma Rifle and Ballista would have their mods be barrel attachments while the Super Shotgun and Heavy Cannon would have their mods be underbarrels (Meathook and Micro Missiles) and optics (Precision Bolt).

Ideal Damage Models:

The Combat Shotgun would probably deal a total of 200 damage per shot, split among 10 pellets.

The Super Shotgun would fire in a hyperburst, so technically doing twice the damage per shot.

Both the Heavy Cannon and Chaingun would deal 50 to 60 damage per shot (those are the numbers I see crop up in some Battlemode gameplay videos) (coupled with the Mobile Turret mod for the Chaingun that lets it shoot three extra bullets for the price of one).

The Plasma Rifle would deal 25 to 30 damage per shot but has the nice bonus of having a small blast radius and setting things on fire.

Both the Rocket Launcher and the Ballista would be perfect against airborne targets like Combine aircraft.