Instructions unclear, states it shoots projectiles but does not say what kind? did not seem to work with arrows!

Thanks!

If you're seeing it (and the Phantasmal Rifle) in game that means you have Guns Without Roses installed. These 2 are guns that behave like those from that mod, and so they use Guns Without Roses bullets (Flint Bullet, Iron Bullet, Blaze Bullet, or Maws of Gluttony).