Board Thread:Off Topic/@comment-25396609-20150910235150/@comment-26397825-20150926054455

Hmm. A railgun, because of how they work, would probably be too big for a sword to turn into one. However a polearm like a Glaive, or perhaps a Naginata may be able to handle it. Ask Phantom when he's online next.

Pistol daggers would work.

Rapier revolver would work if it is just the blade that changes into the barrel, but it would require quite a few finicky bits to shift around themselves. The chamber and grip would have to be stationary, or at least the grip would be the only other part that moves to become the handle of the Rapier, straightening out beneath the chamber. Very finicky.