May I ask why?
It's his addon, that he did the work for. He sat there for literally hours upon hours attempting to create a mod that would bring good weapons to the Blockland community. He made it, and I'm assuming you didn't ask permission. Stop being a pretentious starfish, taking other's works and trying to "improve" it. It's his work,
not yours.
"Heavily Modified" - you have got to be kidding me. All you did was change a couple of lines and maybe add a sound datablock here or there.