Time will tell if this one stays around. Obviously the restricted status is a downside, but if you're into PCC's, this is certainly an option. Gives you the superior ergonomics of the AR with the ability to use 10 round Glock mags.
http://www.thetruthaboutguns.com/2014/10/daniel-zimmerman/new-mg-industries-9mm-marck-15-ar-hydra-glock-mags/
http://www.thetruthaboutguns.com/2014/10/daniel-zimmerman/new-mg-industries-9mm-marck-15-ar-hydra-glock-mags/