That is a very broad question. And I seriously doubt somebody is interested in throwing random weapon ideas at you, given the lack of any sort of information about your game.
Your topic has no discussion value at the moment and such a topic often fails to gain serious responses. So I'd suggest you to edit the original post and ask some questions if you really want to turn this into a real discussion. Requesting random ideas is going to get you nowhere.
For instance, you might want to ask:
- how others design weapons for their games
- how others balance weapons so as not to make it too difficult or too easy
- what factors others take into consideration while levelling up weapons or granting the characters new weapons
- what role, according to others, weapons play in the gameplay
Those are some questions that should get you what you want, plus they would give this topic a proper direction. Some information about your game won't hurt either.