I restored a mod 12 and a Mod 25. Made the 25 a 20" riot gun that is now the house gun. Both guns were rusty and missing parts. The 25 has a flat sided receiver so I had a machinist buddy surface grind the pits out on the flats. I sandblasted both with a fine sand necessary for parkerizing. I parkerized both with zinc phosphate from Brownells that comes out gray. Rubbing it down with cosmoline gives it that military green look. Both guns turned out really sharp looking and the finish is very durable. If yours is pitted you might consider that treatment over blue as no polishing is involved. Don't sandblast any surface that slides against other metal like inside the receiver. When you first reassemble the gun it has to be worked to wear in since that finish is not very smooth. At first it works hard but it smooths up nicely after a bit.
