Side Effect: You'll need to sacrafice Marksman into quickshot to make this build work, so you gotta do close range combat if you wanted to recieve maximum damage persecond. And if you have EXTRA 5 SKILL POINTS from prestige you can fix it and put 5 Marksman 5 to get 50% Maximum/Minimum Accuracy
Sidenote: If you feel Marksman does not really neccasary then I'd personally suggest EXTERMINATOR instead marksman Because if you have some Damage VS Infected bonus on your gear/weapons that will do at least 1-3shot Infected
Skill placement per level up
***1Lockpick? Lockpick has been nerfed and you no longer need lockpicking or a key to open Boss Rooms, so you can replace lockpicking with another skill if you want to.
Also you no longer need 1 point into sneak to be able to sneak, this is due to an update that makes it so you no longer need to spend a skill point to use sneak/dodge/sprint***