If you don't want to rely on your aim most of the time then this build is for you! This build spikes in round 3 when you get around 60-70% Ability Power where you can one shot squishy targets with Dynamite + Coach Gun or double Coach Gun. I mostly just build pure damage with this, rarely defensive.
Item purchase order
Round 1
[Coach Gun] applies Burning, dealing 100 damage over 5s. If the target was Burning, deal 75 additional damage instantly.
1,000 
1,000 
1,000 At the beginning you're just looking to get as much damage with your whole kit and getting at least 10k gold for round 2
Round 2
1,000 
Damage dealt to Burning targets grants 20% more Ultimate Charge.
4,000 
6,000 If you have at least 10k gold you can afford Nano Cola and Silver Lighter to get your B.O.B. faster and its the most Ability Power you can get for your buck (30%). If you have more than 10k gold you can look to just get more Ability power items with either ability haste or ability lifesteal (40% Ability Power or more if you can afford). I usually get Furnace Fuel in round 3 if i don't have enough gold to get more Ability Power and they have at least 2 ways of cleansing your burn. In the case where i can afford even more Ability Power i just skip Furnace Fuel.
Round 3
[Coach Gun] gains an additional charge.
4,000 
4,500 In round 3 you're looking to have at least 50% Ability power with buying Energized Bracers and optimally Multi-tool for 60% Ability Power. If you have more than 24k gold you can get Champion's Kit and whatever gold you're left with you use on extra Ability Power (if you just have 24k gold its better to just get 60% Ability Power with Energized Bracers and Multi-tool). With the Double Barreled power you get in round 3 you can get away with using your Coach Gun twice on the same target(s) and applying an guaranteed Incendiary Blast that deals massive bonus damage.
Round 4
4,000 
14,000 If you have a minimum of 29.5k gold in round 4 you can either go for pure damage with buying Champion's Kit giving you at least 85% Ability Power, or you could provide utility for your team by buying Cybervenom to apply Healing Reduction or Liquid Nitrogen to slow the enemies down and you have at least 70% Ability Power which is already enough to one shot a squishy target with either Dynamite + Coach Gun or even just double Coach Gun. Having 33.5k can even get you to 95% Ability Power.
Round 5
Shooting [Dynamite] reloads 5 Ammo and reduces the cooldown of [Dynamite] by 3s.
1,000 1,000 4,000 
Dealing Ability Damage applies 30% Healing Reduction for 2s.
10,500 Getting Early Detonation simply allows you to use Dynamite more often (it counts if you detonate it with Coach Gun). In round 5 you will have enough gold to have both Champion's Kit and Cybervenom, with leftover gold you're just getting more Ability Power to deal massive amounts of damage or any defensive item you feel like you need. You could also get Stacked Sticks to increase the explosion radius of Dynamite and maybe hit more targets with it, but that's situational and up to preference. **In the case where the enemy has an armor heavy team comp you can also choose Incendiary Rounds and Codebreaker to deal with tanky heroes but still stick with ability power in later rounds.**
Round 6
4,000 
Ability Damage and Healing grants 20% more Ultimate Charge.
10,000 MORE ABILITY POWER!!!!!!!!!!!
Round 7
When you deal damage to a Burning enemy with [The Viper], reduce the cooldown of your abilities by 10%.
4,500 
10,000 WHAT DO WE NEED??? EVEN. MORE. ABILITY. POWER!!!!!!!!!!!!!!!
