I have found a police trade-in 18.5 inch barrel for an 870. If I can get it, the price will be RIGHT!!! I would like to have this as a back up barrel. The bore is excellent, however the finish USED to be matte. I would like to take what is left of the finish off and blue it to match my 870. I have never done this before and it would be a DIY weekend project for me. Can I just buy some of the Blue finish at Wally World and slap it on or is it more complex? If you guys could walk me through the process of stripping the matte finish and applying the Blue finish I would be very appreciative.