I think the issue is "intent", if the intent is to buy and resell for the sole purpose of making a profit (as stated in the original post) you are in violation of the BATF rules.
The method of transfer has no bearing on the intent.
Probably not worth the risk.
Two things you need to consider, the hole in the gas block needs to line up with the hole in the barrel and the hole for the gas tube must also line up.
If you loosen the gas block and rotate it so it is aligned and and the holes do not line up you should return it.
Good luck.
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