This build does not have winning 1v1's and it is not meant for "competitive" use. Which means every fight against an equally skilled opponent will be an uphill battle and I do not recommend using this for serious game play.
Build run down
That said, it is effective at what it can do. Thanks to the ridiculous baseline duration of Swiftness granted by Streamlined Kits, the passive Concentration from Alchemy, and of course, the duration granted from Speed runes themselves, you can stack up to 7 minutes of Swiftness if you feel so inclined as to continuously swap to Toolkit when the trait passive refreshes.
This is important for the build because it doesn't use Rocket Boots, and it's primary source of damage is rifle. You need to be able to stay ahead of your opponent if you want to continue doing damage and staying alive. Speed runes do a great job at making this possible with the combined support of the Super Speed granted upon swapping to Toolkit and the Super Speed from Toss Elixir U.
In short, it's really fast and very effective at kiting even without having Rocket Boots. It also has some solid damage potential from the obvious skills of; Blunderbuss, Jump Shot, Throw Wrench and Pry Bar. At least in my own experience, it often only takes two of these skills either to down someone or to put them in critical shape. Jump Shot alone typically lands between 9k and 12k.
Firearms helps to benefit these skills by increasing your chances of critical hits in close range and adding some extra Ferocity from No Scope. Initially I was using Explosives but found that the minor trait, Evasive Powder Keg, will often ruin the stealth from Toss Elixir S. I think objectively, Explosives is a better choice over Firearms for the offensive benefits it grants, but the risk of being Revealed at the wrong time makes it not worth taking. That's just my two cents though. Stealthing to recover or reposition is too important for this build when considering how weak it is in comparison to many other builds, and the benefits of Firearms isn't irrelevant so the trade off is acceptable ( with all conditions met, you should have 103% crit chance. Usually it will be 78 - 93% ).
The whole gimmick of this build is staying ahead of or away from your opponent with your superior speed and waiting for a good time to combo with Overcharged Shot and/or Magnet in to a damage rotation. Toss Elixir X is a great way to completely shut down anyone who fails to avoid it and the build is capable of killing people before the transformation ends. Elixir X also provides some obvious advantages with the potential damage and mobility from Rampage or the multi-CC's from Tornado. Often times if I get Tornado, I'll just use it briefly enough to launch my target and blind them before exiting the transformation to pressure them while they're down.
I've been using this build for maybe a month now ( ? ) and have tweaked it to the point it's currently at, which I'm most happy with. I find I'm able to win a lot of fights I otherwise might not without certain traits, skills or stats and it fairs nicely even against much stronger builds. It is heavily reliant on hard kiting ( obviously ) and against certain builds, on landing Toss Elixir X. So no matter how well you play it, certain things like good Thieves or Revenants can be pretty well impossible to beat. Still, I've had a great deal of fun with this and will continue to use it for some time. I hope if anyone is interested in playing around with core, this build can either provide you with what you're looking for, or can be a template for something better.
Hopefully soon I'll be getting a new computer so I can start recording again. My current computer has been having issues with it preventing me from doing so. But when I can, I'd love to share some footage of this build in action.
Witchery [YWY] | Maguuma/Anvil Rock | Diamond Legend
Hate me if it makes you feel better ... ♫