Yeah, a burr can definitely be an issue, but how are you sure it's galling? Can you see it? Or is the action just sticking or have friction suddenly and it's not wanting to fly between positions on it's own? You will typically have some material being "abraded" off the liners and potentially the spring after you pin it together, in what we refer to as the "break-in".. Typically accomplished slipjoint makers will take this into consideration when they're setting up their action.
If this is the case, you need to get some oil or grease down in the action, open and close it a bunch of times, then flush it heavily with a solvent, and lots of compressed air, blowing out any stained lube, cleaning it completely, then re-oiling it with a good oil for this use, like Quick Release or Nano oil. Typically you'll see a big improvement.
If it is galling heavily, you may have to take it apart. Deburring everything is critical in constructing these knives, but it's a lesson each of us learns from having a problem typically. I think all of us have had to take one apart because everything was flush and perfect, until we opened the knife 20 times, and suddenly the spring is landing below the liners, because we dialed it in, riding on top of a bur somewhere. It's amazing how much they can screw things up.
Another thing to ask yourself; is it necessary, or even advantageous to polish all mating surfaces in the action? Highly polished surfaces under pressure and friction, are more prone to galling, especially the softer of the two.
The slickest actions I've ever felt, weren't even highly finished on the tang and spring. There's a lot of personal preference and theory here, but don't assume that polishing is what's necessary to accomplish this. I'm not saying it doesn't have a place, but be careful, especially on the engagement area of the spring, where the tang rides.
