I have a couple of 94's that I parkerized. The one is a 1950's 94, the other a 80's Trapper.
I also had another 80's era Trapper parked when I broke the front sight off while cleaning, and had it replaced with a ramp, and ran into what FrankenMauser was describing when it came to rebluing the gun. They couldnt get the receiver to match and were at a loss. I told them to forget about it and just park it, and it was the best thing I did, or at least I think it was. Park isnt as pretty as the blue, but its a little more durable, and better for a gun that gets used.
This is the older 94 we did in my buddies garage when we were parking everything in sight.....
Its an old pic with an old camera, if youre interested, I can get better ones.
As far as stripping the existing finish, depending on what kind of blue you want, it can require a lot more hand work, as the metal is usually polished bright before being blued. You can bead blast it, which is a lot easier, but the finish isnt a bright blue that most are used to, and it tends to look more black.
You also have to disassemble the gun to its smallest parts, to get a good job of it, which is something that usually adds to the cost. Youre not going to get a good job if you dont strip it and do it right, blue or otherwise.
The gun above was pretty beat up when I got it, and there was little finish remaining on the receiver from years of being carried there, as well as a good bit of light rust everywhere. I bead blasted it with glass beads, and then used a black phosphate park on it. The stock was cleaned up, but there is still a dark water stain at the butt. Its a great old Winchester, and has been my favorite since I cleaned it up. I really like the short little Trappers, but they dont have that old, Pre 64 Winchester look/feel.