Class Mod-
Class mod MUST be a Cyborg class mod since it can roll with points in (Blue Tree)
Scorched Kairos,
Primal Surge,
Ballistic Bulwark, and (Green Tree)
Endless Bombardment. Preferred passives include ordnance damage, splash damage, gun damage, gun fire rate, or whatever else may suit your build if you want to match elements for example.
Shield-
Watts 4 Dinner is your go-to mobbing shield and is even useful for more streamlined bossing as it requires no setup to proc. The +25% shock damage is actually bonus damage, which means it will always contribute to your damage, not just when you're using shock weapons. If you don't want to farm Origo for one of these, then a
Firewerks from Splashzone will suffice, as it is an excellent mobbing shield.
Enhancement-
Since manufacturer bonuses on enhancements don't get applied to ordnance, you are just looking for suitable passives, which also makes farming one out easier. The strongest enhancement passive in the game is gun damage because it counts as a multiplicative value when on your enhancement ONLY! Other suitable passives would be gun fire rate, gun crit damage, and gun splash damage.
Repkit-
War Paint is an excellent repkit for bossing, but most ordnance will be stowed and put on cooldown whenever you use a repkit, so having a bossing repkit is kind of the only option. If you really want to look for a repkit to use while mobbing, you can use the
AF1000 because its effects will last longer. Look for passives that benefit whatever weapon you're using. This will usually be splash damage or fire rate.
Ordnance-
Disc Jockey is easy to farm out and drops from Sidney Pointylegs in Fadefields, Hungering Plain, Drill Site. The discs will target enemies on ricochet, which makes this weapon one of, if not the best, mobbing weapons in the game. You can shoot the floor and it will seek enemies. It benefits from splash damage too, so almost any ordnance focused passives work well with this weapon as well. It can even be used for bossing sometimes as some larger bosses like The Timekeeper will end up ricocheting into itself and never hit the floor in-between bounces.