When my friend and I was sanding down his CCW to get rid of the forging marks, all we used was sandpaper and Adams Metal polish #1 and #2. All done by hand. To remove the forging lines We used 320 grit in some places, but the 600 grit worked well for most of the rough spots. Then we sanded these locations with 1000, then 1500, then 2000, then 3000, then Adams Metal Polish #1 and then #2. Now his was not trashed or anything, but i would use the same steps and it should work.