As most people have seen the Deej post, the 310 spindle will be dropped to 290 light, but any guns that were increased by infusing spindle into them won't be affected.
Will you give up your black spindle for a gain in light
Or
Keep the gun for its uses
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Why don't you buy the spindle from a blueprint, infuse with legendaries to get close to 300. Then infuse with raid weapons, then the 310 spindle. Nek minute, you have a 310 spindle that won't get patched.