Talk:Hammer Shot/@comment-94.169.213.96-20130816213754/@comment-201683-20130822062543

Contrary to what people have been saying, there is something else to consider. Stun is a damage type, so while it doesn't say 'damage', what this mod actually does is apply +40% stun damage to your shots. Damage with this type has a chance to stagger or stun enemies. Presently, I do not have the mod, but I'm pretty sure stun and stagger have fixed chances.

From the wiki itself:

Stun is currently a damage type only used by a few melee weapon's jump attacks.

This damage does not ignore armor, but otherwise enemies do not have resistance to it. Unique effects of this damage type include the ability to stun or stagger enemies, as its name suggests.