Simple, cheap, powerful

Super strong at Mid/Long Range early game with the ⚔️Ferro (IV) , cheap to upgrade
⚔️Arpeggio (III) is great, just make sure to use ⚔️Arpeggio (III) or ⚔️Arpeggio (IV) as Arpeggio’s starting fire rate is not enough IMO.
I think you can add some 📦Light Impact Grenade , 📦Gas Grenade or 📦Li'l Smoke Grenade depending on your preferences.
📦Herbal Bandage is optional, you can run simple 📦Bandage for early game

This build is going to be weak for close combat compared to builds with Shotguns.