Concerns of The Deep? I'm Blastin'

Buy left to right
Go for headshots during lane to deal some burst of damage with Headshot Booster
Be mindful of damage fall-off! Once you obtain Kinetic Dash, try to dash jump every time you engage the enemy to get more ammo and a lot of fire rate!

If you happen to be struggling, buy one and sell it later
Extra Regen is the most passive option.

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Try to use Splatter (1) when your mag is near empty to reload your gun with Quicksilver Reload
As you take damage, you'll also be dealing more damage thanks to Berserker! After getting Burst Fire, don't forget to try and slide to gain infinite ammo!

If you find yourself dying easily or taking too much damage, consider one (or more) of those items!

Buy left to right
After Lucky Shot, I suggest Hollow Point and Vampiric Burst but you can go for items in the other categories for either more Damage, Fire rate, Anti-Healing or Armor Penetration (AP)!

Siphon Bullets and Focus Lens won't directly increase your damage but will still help deal more damage!

If you feel like the enemy out-heals you.

If they have too much resistances, consider one of those two.

Need to shoot faster? All of those will help doing so
Fury Trance and Blood Tribute do come with downsights though, be mindful of them.

These items will help you have a better time against specific enemies or simply allow you to modify your gameplay to something that fits you more
Keep in mind that these items are NOT part of the build
Decay, Silence Wave, Knockdown and Curse are powerful actives that can be bought to counter specific heroes.