User blog comment:DiegoAnime3000/It's also a gun! -Team CRDL/@comment-25059531-20140613204916/@comment-3146930-20140616002156

Looking at the mace closely, there is a small button by the handle and what appear to be tracks for the head of the mace to move (plus that ruby thing at the top). If anything, it is safe to say that his mace isn't just a mace.