I think this belongs in the "That was fast..." pool.

Chizuru has the aim of a stormtrooper, apparently.

Is the gun's forward grip floating?

http://en.wikipedia.org/wiki/File:Thompson_21_and_Rifle.JPG

Believe it or not, a lot of Thompsons looked like that. Probably the artist just didn't notice the tiny connection point, unless that dark spot is supposed to be it.

You missed.

Etaoin said:
http://en.wikipedia.org/wiki/File:Thompson_21_and_Rifle.JPG

Believe it or not, a lot of Thompsons looked like that. Probably the artist just didn't notice the tiny connection point, unless that dark spot is supposed to be it.

I think the dark spot is it, considering Kyouko's right foot/leg appears to be missing right in that area, I'd imagine it isn't the back of her shoe or anything.

...and in the episode, there wasn't a foregrip on the gun at all.