And as an afterthought - you might be able to accomplish the smoothing without a complete disassembly. You could try just removing the firing pin, insert the rolled 600 grit into the channel, and push down on the firing pin stop from the under side of the slide to get the channel clear. You'll need to keep constant pressure on the firing pin block while you're doing the operation, but it might just work. I haven't tried it this way, but it might work - at any rate it's on you if you want to try it that way. And don't forget the Rem Dri Lube when you reassemble - it's some pretty magical stuff.