Glock Slide Serration Sanding Guide (standard rear serrations)

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I restored a badly mistreated airsoft Glock slide with intentions of restoring its rear serrations to their former glory (see pictures for before/after). Therefore, I created this sanding guide. It should be real-spec (7 3mm wide serrations with a distance of 2mm each), making it suitable for use on genuine slides as well. This guide utilizes thin slices of standard sanding paper. I only sanded the serrations to 300grit while polishing the rest of the slide to a mirror finish, creating a nice contrast between the two. I'm extremely pleased with the outcome. (I began with 300grit and it didn't take much effort to remove all scratches previously present, but the slide is made of pretty soft AlZnMg, so you might need to start lower, just don't sand too deep with low grit paper or you'll reach the depth limit before finishing smoothing the surface (see 'how to use' [5] for a workaround). (I designed it this way to be able to use the depth limit and ensure the serrations are exactly parallel to the slide when finished.) The sandpaper fixation on the sanding slide is not ideal, but they worked for me. I didn't want to reprint it, so feel free to improve them if you can.