The girl here is rocking an IMI Negev in 5.56. It's fitted out with what appears to be a Aimpoint Micro T2 dot on a Unity FAST mount, an EOTech OGL, and a SureFire high capacity mag via a STANAG magazine well adapter.

Edit: I've been notified that the pistol is an IWI Masada so I'll be tagging that as well.