Hello.
I'm making Engineer set in Team Fortress 2 with my friends Ghostbuster and BSoD.exe. For now we only have concepts of weps: Trammel, Gauss Gun, shooting nails and hat, which is not ready yet. Next week we'll try to have a good idea with hat and create weapons' models.
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Also as a side note, a nail gun was a weapon for the Scout that was originally planned to be in the vanilla release of the game back in 2007, but Valve decided against including it. It's also been done a few times by other community members.
And it's not nail gun. It's Gauss Gun.