Q: In the anime version, Rin has a few different ways of firing her Gandr. Is her multi-finger firing method any stronger than her original single-finger firing method? <Fruit-punch Samurai M>

Nasu: That isn't her true Gandr. Her index finger shot is definitely the strongest.
Takeuchi: Then why does she do that? Is it some kind of homage to 004?
Nasu: Rin is just an intense woman, so if she did that her Finn shot would turn into a Finn machinegun. We call it the Miura-style Gandr. It's really a new Gandr, along with the Finn rocket launcher that comes from her knee. With proper timing she could catch her opponent and strike their torso or face at point-blank range. That person would definitely die.
Takeuchi: I know, that's why she's the Shining Wizard!

Fate/Stay Night Animation Material I; Q&A, pg. 40