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Engelsgaard is someone on the discord who did that pesky math for us.
Since the multipliers and percentages vary on most weapons, it can be hard to decide which build will be the best.
All these calculations aim for the highest DPS (damage per second) and assume you are at forge 20.
In some cases you might be able to achieve a higher crit damage by sacrificing base damage, to maybe get over the one-shot threshold for certain enemy types, but one shot thresholds are very dependant on MMR% and situational, so unless you are willing to rebuilt 5 times for that, always go for the recommended build :-)
Other stats that modify DPS, like rate of fire and reload speed are not taken into account, this formula does not work for all weapons.
For lower forge levels, or in general, or if you want to build a Bounty Hunter or Affiliation weapon, or to check if maybe there was a typo, you can calculate the values yourself.