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In my experience, the worst for gas sting in the eyes is my 16” 7.62x39 upper full auto suppressed. Next worst is a 10.5” 556 upper full auto suppressed. 14.5” and 16” uppers are much less. My 300 blk upper is 8.5” and the gas is actually less irritating than the others. I think ammo choice affects this dramatically. Some ammo creates a more acrid gas when fired.
I can’t comment on 458 or others because I’ve never tried them
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