Inappropriately sized Culverin

[Wise Old Man]

Could I use a small sized Culverin and support it with my other hand to fire without the -4 penalty? (Given the -2 for inappropriately sized weapons)

[GM and the Holograms]

I'd ask your GM, it seems to me that it should work that way, but it lacks the wording of the double hackbut, as I'm sure you noticed. I'd allow it for a home game, assuming i was allowing guns