Personal experience of a fricken picky old grouch like myself, has for over 50 plus years taught me that no one will match two different blue jobs the way you really want. So it's best to re-blue the whole firearm. Consider polishing the firearm yourself if you have the tools and skills, and send the prepped gun to Glennrock Blue for his famous 10 tank blue. If you do your part, the gun will come out better than you can hope for, I've had results that were astounding like an old time pre 70 German Weatherby Mk V rifle blue black finish you could fall in to, and for a
mere hundred bucks or so you really can't beat this deal as you'll happily dance all the way to the stinking bank, and no one will believe the deal you got, once the feast their eyes on your like new gun.
Best Wishes
Aloha
Glenrock Blue - Gun Bluing, Firearms Restoration and Refinishing
PS if money is no object, get his 2000 grit guaranteed no waves or ripples true Masters Finish, not cheap, but real quality, like from the golden age of firearms master craftsman, which is rare to find in this day and age.