MTAR-21

The IMI MTAR-21 or Micro Tavor is a compact variant of the Israeli TAR-21 Assault Rifle, also designated as the X95 it can be converted from a 5.56x45mm Assault rifle into a 9mm Submachine gun with a "coversion kit". The MTAR-21 is set to be the future standard infantry weapon for the IDF.

Battlefield 3
The MTAR-21 is seen briefly during the Close Quarters - Ziba Tower DLC Trailer.