I've noticed several times that weapons I have equipped, but not using at that moment, will level up when I get a kill or complete an objective. (My secondary will level up when I get a kill with my primary and vice versa).

So do all of my weapons level up at the same rate once I have them equipped for a mission?


It depends on how you complete the mission and kill enemies.

Affinity (the exp used to level up weapons) is split amongst all your equipped items. When killing an enemy with a weapon 50% of the the affinity goes to the weapon used and 50% to your warframe. You also gain affinity when a nearby ally gains affinity, 25% of the gained affinity goes to your warframe and 75% is split evenly amongst the rest of your equipment. You can read the full rules regarding affinity here.

  • If you are using a mastered Warframe or weapon, is the affinity that it would've gained lost/wasted or redistributed? – Yuuki Sep 14 '18 at 18:01
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    @Yuuki Lost. It's the reason that people tend to unequip other weapons when they're trying to level up a specific one. – Powerlord Sep 14 '18 at 23:06
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    Arguably a spoiler, but once you complete The War Within, you'll be able to add focus lenses to your max-rank weapons and warframes to convert some of that "lost" affinity into focus. – solarshado Dec 9 '18 at 9:47

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