9/16-24 is 14.29mm outside diameter and Internal is about 13.2 depending of the manufacturers tolerances.
15x1 is 15 mm outside diameter and about 14 mm internal .
Don’t shoot with your 15x1 suppressor screwed onto your 9/16-24 barrel or you might end up with a grenade launcher and see your suppressor disappear and wreck its threads.
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