Gattling damage

How to increase gattling knife’s dmg?
I see people going over 20k-56k+
While l hardly..do even 10k( n that was just once...) ..ouch..
Ahm, this is for halberd-Dagger build btw :3
Help would be appreciated ><)!
Since l took gattling.k as secondary dps..failure till now :’3

 

dagger skills have low multipliers, so raw attack alone doesn't make much of a difference. (this is most visible on halberds)
the dagger's weapon atk affects dagger skills' damage in multiple ways.
Gattlng Knife gets stronger with STR, AGI and DEX (all are equally effective).

for a physical attack halberd, STR AGI is standard. DEX just adds accuracy and boosts Gattling a little, but it has the lowest priority and you may also use CRT or VIT depending on your preferences.
a dagger with high weapon atk is recommended.
Long Range (shot skills) also boosts damage by up to 10%, but Amazing Throw should be learned first. it costs less and doubles the damage at a 30% chance. (that's a 30% increment on average)
use equipment with critical damage (you get critical rate from Punish Ray) and physical pierce.
the rest is a matter of proration, and no 'save' combo of course.