Puella Magi Madoka Magica / Spec Ops: The Line crossover commission! Starring Sayaka, Mami, and Homura(’s butt) on their way to a sand-engulfed Mitakihara City.
The M249 would be considered more of a light machine gun, while the Tavor and what seems to be some kind of AR-15-derived rifle would be categorized as assault rifles in most classification systems I have seen.
I find it interesting that Sayaka is wearing a US flag patch.