Guns
With a focus on being good with any gun, you can really use anything you like and the build will support getting the most out of them. Some weapons work particularly well though, so a few suggestions are:
Wombo Combo - Probably the best mobbing gun in the whole game. A perfect roll would have 80+ mag size and Hyperion (Accuracy Grip) for some add convenience but it's completely optional. 
Anarchy - It's back and still super strong. With 
Al Centro we can remove any of its negative effects, meaning we just end up getting 300% damage at max stacks.
Complex Root - An amazing weapon for bossing. The right rolls on this can make it much much stronger. Getting Jakobs (Ricochet Accessory) and an Atlas (Dart Underbarrel) will make this incredibly strong for bossing, particularly larger enemies like the Vault Guardians.
Queen's Rest - This gun is slept on, especially with stickies. It is a nice weapon for mobbing, but for bossing it is exceptional. Aim for 17% stickies and Jakobs. You'll melt any boss with this. For dig sites, you can pop 
Instinto and wit 
Metal Management you'll get a brief window of being able to build up a lot of stickies with this. 
Kaoson - Great for bossing, can get a ton of stick grenades out very quickly.
T.K's Wave - With Torgue (Sticky Mag) this will out perform Kaoson, doing insane damage.
Golden God - With 
Las Jaras we can actually fire this infinitely. This means it's incredibly strong for bossing and mobbing. A Jakobs license on this makes it even better, particularly making a top choice for mobbing. Aim for high fire rate and maximum heat. Maximum heat actually impacts how much Las Jaras will regen on CoV guns.
Stray - Nice mobbing choice. Don't even need to aim. You want a Jakobs roll on this to make the mobbing even better.- Jakobs Guns - Since we naturally get crit, we synergise well with Jakobs weapons, particularly shotguns.
- Vladof Guns - Particularly Boory SMGs. With the double barrel alt-fire, we can shoot hundreds of bullets per second. With tap firing and mag size enhancements, you can do this infinitely. Or just use
Bullet-Buddy Deluxe. If it has a Jakobs (Ricochet Accessory) you will clear out whole rooms in seconds. - New: Rowdy Rider - Amazing for mobbing, potentially up there with the Wombo Combo. Being able to ricochet to 3 enemies makes clearing really fast. It's also possible to roll positive crit damage on it, negating it's only drawback.
Rep Kit
Triple Bypass - An obvious choice for Rafa to keepup our cannons using 
Now With Caffeine. The rolls on this can be pretty much anything you want depending on your preference.
War Paint - A better choice for bossing. With good rolls on gear you won't end up needing it but it can be helpful, particularly if you're aiming to build up stickies.
Enrage on our rep kits actually isn't very useful to us. We get so much Damage Dealt bonus from 
Temerario that it barely benefits us. Going for Amp (Amplified) or Leech (Parasitic) is much more beneficial for us.
Ordinance
Our best choice by a large margin is the 
Firepot. It benefits from our gun damage bonuses and builds up stickies. You can chuck this at a tanky enemy, wait 2 seconds, swap/reload your gun and they'll be deleted along with most other things around them.
With the crit knife nerf, it actually doesn't impact the build at all. How ever this does give us a bit of flexibility. The crit knife now stacks with itself, meaning with a 3 charge version, you can reach +90% crit chance. If you wanted to, you could use the crit knife instead of putting points into 
Brain Dump. I wouldn't advise it unless you either really hate the Firepot or need the points elsewhere. Note: With 1 point in Brain Dump, we can still get over 100% crit chance when fully stacking the crit knife.
Class Mod
Dancer is too good to ignore, there's not a purple mod that can compete in this build. You will want to roll 1 
Soltado and the rest in Temerario / 
The Thrill. Ideally you want to get 5 in Temerario but even just 3 points adds a lot of damage. Your best roll is Crit Damage, but Gun Damage is also good. Gun Crit is also nice, we can even hit 105% crit chance this way.
10/5 Temerario can boost up to 500% Gun Damage.
10/5 The Thrill can boost up to 100% Fire Rate.
Shield
We have 3 good options here. They all have pros and cons, but you can also just swap them out freely.
Note: If you want to use AMP, which you can and should try to with the build, do not go into 
Survivor more than necessary or at all since this will only boost capacity, not rate. Since we our using shield regen to get AMP shots, we want to have a good balance between recharge rate and capacity. The lower our capacity and higher our rate, the more AMP shots per second we can get.
Watts 4 Dinner - Our best DPS option. We want to roll at least 1 Siphon Tolling on it to be good. We can get overshield from 1 point in 
Field Repairs to have it for bossing before ever hitting anything. The perfect roll would be Siphon Tolling and AMP Synergized. The shock damage also applies to our Peacebreaker cannons. The recharge rate on the shield is always pretty low, so we don't get many AMP shots per second with this. 
Super Soldier - A very nice option. The ammo regen can be very nice for small mag guns, movement speed and fire rate are added bonuses. Siphon Tolling and AMP Synergized are our best rolls here too. Without Siphon Tolling I wouldn't recommend this for mobbing in UVHM 3 or higher. The shield has a decent rate but also a large capacity, making it give a similar number of AMP shots per second to Watts 4 Dinner. This also means Survivor will negatively impact us even more, so do not go into Survivor if using this with AMP Synergized. 
Guardian Angel - Specifically with 3 AMP Synergized. This shield has a crazy high recharge rate and somewhat small capacity. We already get 0 delay thanks to 
Shield Barriest and hugely increased recharge rate. As an example, a Guardian Angel with 3830 capacity and 4337/s recharge would be boosted up to 13011/s. With a 28% amp shot cost, we only need to recharge 1027 shield. This means we can get up to around 12.6 amp shots per second. This means there is a sweet spot with weapons that closely match our AMP shots per second. Guns that are too slow or too fast will benefit more from Watts 4 Dinner's bonus damage than our AMP. This is obviously also a very specific roll, unlike Watts 4 Dinner that can work just fine without AMP Synergized.
Which is best changes per gun, so a perfect Guardian Angel might not always be better than a Watts 4 Dinner depending on what you're using. Use whichever you prefer, have available, or whatever feels better to you; you'll still be doing crazy damage regardless.
For early game 
Firewerks is an obvious choice, it's an amazing shield for mobbing and super easy to obtain. The rolls on this don't matter much, just aim for the best missiles possible. Use this until you can get a decent shield listed above.
Enhancement
Following the focus on being able to use any gun, you can really use an enhancement you like depending on your guns.
The stat rolls also come to preference. The highest damage bonus would be going for Crit Damage. Gun damage is also good. Mag Size is a nice convenience choice. Fire rate is also nice but not very needed. Ultimately it comes down to what you're focusing on more.
Recommendations:
Jakobs Sequencer with Critical Damage - Our highest damage option. Makes our damage scale up to even crazier amounts. The description does lie a little though. It isn't Bonus Damage like it describes, it actually works more like Gun Damage does in enhancements. So it actually adds to our damage modifiers instead of dealing an additional instance of damage like other Bonus Damage skills.- Jakobs Piercer with Critical Damage - Allows us to reach 95% crit on guns with Jakobs licences. This makes the crit knife basically pointless to us.
Multistrike combines Sequencer and Piercer, making it our highest DPS option. - Vladof Box Magazine with Mag Size or Fire Rate - With firmware we can get up to 70% mag size on all guns, 90% on Vladofs, which with Las Jaras can make our mags feel bottomless. Feels great for mobbing.
Quicksilver mod can give you 100% crit rate for free, allowing you to move points from Brain Dump. CoV Rafa feels fun to play and I'd suggest trying it at least once.
Studfinder is very nice for Torgue guns. Really good for mobbing and can be pretty nice for bossing. This wouldn't be as strong as the other options but is nice for Torgue enjoyers.
Rafa
Peacebreaker Cannons
