No he has 67% max rate on his own, and hes getting 10% from his bm3.
Idk if you can read the synergy effect in Korean or not, but it says Enhanced Shooting, and only Enhanced Shooting. He triple stacked that; wasn't using any other synergy.
And you could also tell from looking at his skill bar.
And the rate in his character screen also drops to 67 for a second during his 12th hit.
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