I just did one myself. Very easy if you follow the instructions and watch a how to video or two on YouTube. I just used a drill press and drill press vice for the end milling and a hand drill for the pins. Some 200 grit sandpaper to finish up. I'm still waiting for my custom slide to be built but I test fit with a friend's OEM slide and it's good to go. I would definitely advise sanding and polishing the slide rails. Made the slide move like it was on ice.
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Sweet! Found a great deal on them right now so I’ll pick one up for sure! Did you get OEM parts for the rest for source some enhanced/ upgraded parts?