Mida, Fang and VoC are all favourites but I always go back to an early FWC drop I got - The Calling. Not rollable but I was super lucky to get a god drop with Firefly, Explosive Rounds and lightning fast reload on precision kills. Similar rate of fire, impact, range and stability to Fang. Can outgun Thorn and TLW more times than not. Always my go to in PVP.