It literally seems like a full 25% which means it must be V2 type, and multiplicitive with other damage types. I always thought it was additive gun damage but Moze and Zane don’t have a ton of other options to use depending on your build.
But I was messing around with Jack testing dummy and noticed the large increase. Too bad I can’t very well stack the Anarchy with her against a test dummy. I’d like to see how high I can get that damage for a general mobbing weapon.