Gunaxe?
Gunscythe?
Gungreatsword?

http://images.wikia.com/nanoha/image.../Bardiche2.png

How did this not show up yet? Children, I am disappoint. ಠ_ಠ

And gunstaff for the mages: http://www.youtube.com/watch?v=1hm3IzZRtFQ&t=1m32s

Divine Buster not included.