In addition there are these pictures of the main characters that give us more information on the weapons in the film.
http://photos.actionfigs.com/g5594-sucker-punch.html
There is also the first steps of the website where more info on the weapons is located too.
http://suckerpunchmovie.warnerbros.com/
Abbie Cornish
AR with full length rail, flashlight and red dot.
Irish medieval sword
Some type of rifle strapped to her back, possibly a shotgun due to her having some shotgun shells strapped to her thigh. (Actually confirmed since I know she carries a shotgun) It looks like a very modern variant though.Maybe a XM-26 LSS but more likely another AR.
Jena Malone
UMP 45 with red dot
sawn off shotgun on her thigh
Vanessa Hudgens
shortened MP5?, what variant I don't know
And strapped to her thigh is a tomahawk. Which she has already mentioned in interviews.
Emily Browning
That pistol on her side is definitely a 1911 judging from the size of the magazines. As seen in the figurine.
Unknown submachine gun she is holding
And her katana is confirmed.
Jamie Chung
Carries a glock, what variant I don't know.