How it works
A TTK tool, not a gun builder
The tool focuses on showing a gun's real TTK when you have mixed shots on different body parts.
It attempts to answer the question of "which gun is better" when you already know the meta/favourite build of your choice of guns.
At current stage, I don't plan to make it a gun builder as we already have a lot of them.
Therefore, you will only see those TTK-related attachments on each gun, and you will only see how they affect range, RPM, and/or damage.
Convert headshot ratio to body parts hit ratios
It's hard to collect hit ratio of every body parts in this game. Based on very limited data from my personal playing of similar game (i.e. BOCW) which gives in-game stats of body parts hit ratio, I arbitrarily plot this graph as a rule of thumb which converts your headshot % into hit ratio on every body parts.
Why this can work
For most of guns, the damage of non-headshots are very close. When you mix your hit on all body parts together to calculate average TTK, a small error won't make much difference on the final result (as long as the headshot % is correct).
Absense of neck damage
We don't have enough data, and the actual chance of hitting neck is very low. Fortunately adding a hitbox won't require overhauling the site, so it may be added one day.
How TTK is calculated
It calculates the expected value of a gun's TTK using DP algorithm. You can find the very short algorithm in
quick_ttk.js. As it takes hit ratio of every body parts into account, the TTK value will be different from what you see elsewhere.