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Fewer (or more) moving parts – on their own – don't affect accuracy

Tolerances certainly do – there is a reason why AK pattern firearms are inherently less accurate than AR pattern firearms

I have fired some semi-automatics that are more accurate than some bolt-action rifles

And I've seen several people (all competent, and at least decent shots) shoot the same gun on the same day in the same conditions, and have different results on their respective targets