The Mac-10 transforms first into a short sword with one fucking hell of a girth. The disc on the bottom of the hilt's chain can also be weighted, although i can't say for sure if that would help with balancing the weight distribution. The other form gives the user 2 options, one holding the handle and whip it like Ivy Valentine, and the other option is holding that weird oval ring and spin it like a staff, or a 2-chained flail.

PS: yeah, i noticed the number of bullet-dart-chains on the handle-end isn't the same. Silly me. orz

PPS: You can hang the squareish rings on the hilt, as the giant Fennec demonstrates. They come off the restraints by user command when you take them off.