Ok this might sound a little strange but trust me I thought the same thing when someone told me this then I tried it. I had a Franchi AL48 that my father gave me when I was 15 yars old. Through the years almost all the blueing had worn off the steel barrel and most of the paint off the aluminum receiver. I took the rest of the finish off both the barrel and receiver with a wire wheel. Then I bought some auto grade flat black primer and gave both two coats. Next I got some high gloss black auto paint and put two coats of that on. The gun looks so good I hate to use it now. It actually looks better than when it was new. The gun actually looked really good with just the flat primer on it so I guess if you don't like a gloss finish you could do a flat finish too. Oh, I also redid the stock and foreend by sanding, restaining and several coats of high gloss polyurethane. But even that could be satin if you like the dull finish.
Hope this helps.
Tony21