[Daisuke]

The concept is good but 5% per rarity, -15 gun damage, and 1.5x res is too much.

Multihit guns are a bit strong but the only thing bringing them over the top is spirit hunter which is getting nerfed soon. Those kind of numbers make them trash and a combination of them can literally make even the current spirit hunter do 0 damage. especially considering that you can equip multiple items of those types.

And that's ignoring the extra evade Ceramic gives.

Making it 5% on kevlar and -3 or -4 gun damage on ceramic would be more appropriate imo.
Magnetic shield is also a thing.
You shouldn't be able to bring a single item and completely negate an entire class. If you're going to counter a gun with your equipment, it needs be the focus.
Also I don't really see the point in making shell damage factor in res on top of this. Most players are generally harder to crit than normal mobs, especially with faith being a thing, and it's only chain shell that's going to be outputting a lot of damage which requires a chain of constant crits.