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I put a nickel boron BCG in my ar and went ahead and put oil on it and put it in the safe. A couple days later I took it out. The oil ran off the BCG and was down on the buffer. Oil will simply not stay put on nickel boron. In fact, the BCG feels "oiled" even when dry. That stuff is slippery. It isn't a must have by any means, as the regular old mil spec BCG has been doing its job since the 60s.
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