Sub-stats: ATK&Crti Mutiplier&Weak Point&Magazine; same as piercing light, 12% magazine is required for maximum magazine.
Concentration Priority is better than Bullet Intergration on perforator, the abnormal situation on piercing light is because PL's ridiculously low base crit mutiplier and BI of sniper has a quite reasonable stat.
Payout is the key for hand cannon haileys. When triggered, u need to fire quickly to ensure the whole window is perfectly siezed. And that requires some aiming skill.
Actually PL can also be used for Infernal Walker, the fastest way is still PL. But that gameplay requires hailey's storm snare critical hit. Which will be an unstablility because of the stupid crit resistance. Hand cannons can deal higher total damage which makes them more useful when facing an enemy PL can't finish it in a single zenith round.
A little disgression. I hate boss designs like infernal walker, extreme stats, 300k DEF makes fiream damage minimum, and the most ridicolous resisitances, 6.88 million fire resistance, 1.52 million electric resistance, and 792k toxin resistance, this is much higher than any colossus. However its chill resistance is only 38k, this is even much lower than molten fortress, and just a little higher than pyramaniac. Totally chill limited boss. Yes, nexon said this kind of new colossus are more focused on attribute, but what about HP? Infernal walker has higher solo HP than 4 player HP of molten fortess, and close to 4 player gluttony, this is insane. And u can still deal damage when rampage, no interesting mechanics, only extreme stat. And I hate that.