Quote Originally Posted by Stupiduglytaru View Post
Does it just take 25% of the dmg you did while under it and apply at end?
That's correct.

Well, according to the japanese forums (thanks to @kiyamashuuichi), here's a full buff Wild Fire (lvl56 MCH) dmg:

Gauss Barrel ON = 1900 to about 2000
Gauss Barrel OFF = about 2100-2200

Now i'm confused if it's better to do an opening with GB or not :/