It depends on what you're comparing them to. I've had some English, Spanish & Italian made guns that the screw slots were ridiculously thin and difficult to grind a screwdriver blade down to fit them & still have strength in the blade.
Parkers on the other hand are fairly easy to correctly fit screwdriver blades to. On most Parkers you can usually find a bit that will fit in Brownell's master set along with their thin bit set.
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