If you can find it, buy some pumice powder. Mix it with some 5/10 weight motor oil and make a "loose" paste. Apply to the rifle with a soft cotton cloth rubbing GENTLY until you get the bluing patina you want.
That is the concoction and system used by the firearms restorers at Williamsburg, on antique rifles to remove any rust and bluing before they refinish the firearm.
L.W.
"Always go straight forward, and if you meet the devil, cut him in two and go between the pieces." (William Sturgis, clipper ship captain, 1830s.)
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