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I tried the same, but I think it isn't that simple.
The spindle fits perfectly, and the solution is some ~30gr lighter than the genuine XX1 GXP crank for fatbikes. But the q-factor is way to big for 170mm rears. Perhaps this works with a 190mm rear or you must look for the smaller Q-156 version of the BB30 crank. I had only the wider version with q-168.
(the shown race face spindle is the 170mm version and the gxp XX1 also)
(The weight of the BB30 version with race face spindle is about 475gr.)

Bicycle part Line Metal Bicycle accessory Steel
Carbon Metal Bicycle accessory Tool Steel
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