On the 2 I built, the front half had Parkerizing under the paint. And the paint could be dissolved with about anything, including rubbing alcohol. The UF had no Parkerizing under the paint. The UF paint was a harder to dissolve than the front paint. My guess is that the UF was made/finished in a different factory and then assembled on the rifle at the arsenal. Both kits had almost no action wear, so I doubt either was refurbished.