If I did remove the hinge they wouldn't be able to combine for gun or wolf mode. The hinge also serves as an extension to the peg so it reaches the fist hole, since the figure's wrist is a half-centimeter taller and would meet the back half of the gun before a normal-sized peg could reach. I could make a version with double-length pegs instead of the hinge and connection feature, but I don't see the point.
I've been getting requests for swords and I've been thinking over exactly how they'd work in the alternate modes. No guarantees yet, though.