Like all the others stated run it wet or another option is to put some bearing grease on the rails of the BCG.

That's what I do before going to the range. I put a dab of high temp bearing grease on my finger, and put a very light smear on the rails. A little goes a long way.

When I get home, clean rifle as normal. Quick light coat of CLP on the BCG for storage.

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-John