Hello there people, long time no see 
I just wanted to chime in here since I’ve been dabbling with Zero pistol builds for years now.
Try this:
Disturbed stalker com +6 rising shot, +5 followthrough
Explosive relic, and a Harold.
I usually go with a defensive shield like a turtle shield, but you can go full offense with a rough rider or bee shield if you really want to turn it up to 11.
It is ridiculously strong. I used it myself all through Digipeak, and I keep getting suprised at just how strong it is.
And if you are playing with friends you can swap to a leg. killer com (remember to spec with that in mind) for better team synergy. In my opinion the disturbed stalker feels stronger with the Harlold, while the Killer com feels stronger with Maggie, and Lady Fists (also excellent options).
Sniper builds are fun, but for mobbing you can honestly one shot most things with a pimpernel so I don’t really see any need to go all out sniper build unless you want to, or if you are killing bosses.
Edit: Just realised I’m 3 weeks late to the party… Sorry guys, just replied because it was a relatively new post in the Zero sub-forum.