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You appear to have some familiarity with modern cartridge handguns, and so you may already have a set, but in case you don't....
Gunsmith screwdriver set. Best I've found is Brownell's Magna-Tip, but there are many that will do just fine; I have a Chambers set and an old set of Wheeler wooden handle drivers that are old friends.
Best investment you can make for working on your expensive hobby.
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