I recently aquired a Remington 870 Express 20ga. and I have noticed that it has a spot on the rear of the reciever where the matte blue finish is allowing some shine from the metal to show through. The spot is not very big, only about the size of my thumbnail, and you can see it only when the light hits it at the right angle. Its not much, but its enough to bother me. I was wondering if anyone knew of a matte blue repair kit or some kind of other remedy that would match the finish on the gun, but cover up the blemish.