IMHO, you can get it looking pretty decent without a complete refinish, which is really more effort than it's worth on this particular platform. Unless you're going to remove the selector switch and do some of the other accuracy mods. I did refinish the flash hider with aluminum black, then weathered it, but just did some light weathering on the rest of the gun with 800-1500 grit sandpaper and 0000 steel wool. Also used some brass black on the brass parts, and added a 3D printed ANH grille and mystery disc.
Makeup pads work pretty good for applying the aluminum black, and you can get them pretty much anywhere.
View attachment 978342
View attachment 978343