Machine Girl, not Machine GUN girl...
Ami the Machine Girl is basically armed with 2 kinda weapons
1. A Gatling Gun.
This is copied from Planet Terror where the heroine loses her leg to zombies and its replaced with a gun.
2. A Chainsaw.
A tribute to Evil Dead 2 and Army of Darkness where Ash (Bruce Campbell) battles the forces of the dead using a chainsaw.
The Japanese loves Bruce and his chainsaw antics that they pay tribute to him in the movie Stacy. There is a chainsaw attachment which you can fit on your hand. The chainsaw weapon used in that movie is called "Blues Campbell" or "Bruce Campbell's Right Hand 2" (no shit =.=)
Where can I buy a chainsaw? ^^