I would just get the metal slide, upgraded recoil spring, and metal mag catch.
Since the metal slides don't usually come with sights, and you risk damaging them if you take them off the plastic slide, I would also get some nice night sights. Everything else is gravy.
Ooh, having a bunch of spare mags is nice. I have 4 mags total for my G17. And don't get high flow valves unless you plan to install them in everyone of your mags. Makes things more consistent when you switch reload.
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