The way I see it. Since you can't farm weapon parts, like you can farm Spinmetal or Relic Iron, then either some players at some point will be out of weapon parts, or weapon parts are completely superflous to the game. Think about it. A currency that you'll never run out of, is just meaningless.
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That's the real solution. We have too many currencies. The planet resources, glimmer, and marks should be plenty.