New Police 870 Barrel Residue

A non-internet buddy of mine called me about his brand new Rem 870 police model 12 ga. He had read somewhere that they are packed/coated with cosmoline. So he decided to strip the gun and remove any cosmoline. The outside didn't seem to have it, but some internal parts were coated in cosmoline or somthing that looks like it.

Whether or not the substance was cosmoline isn't salient here except in regard to explaining why he stripped the gun (to remove cosmoline).

The inside of the barrel appeared to have been coated in some gray material. As he worked to free the barrel of the graymaterial, he noticed that it did not come out gray, but silvery. Additinally, the reside was difficult to remove, way more difficult than what is needed to clean out basic shooting residue.

Now the query. Does anyone know what the gray/silvery barrel residue is?
 
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