The X23 NNEMP Cannon takes up much of the Gremlin's dorsal surface and is much bulkier than the far smaller and more portable W/AV G/GNR.
The X23 NNEMP Cannon is a weapon in service with the UNSC Marine Corps. Gremlin support vehicles are equipped with one of these turrets for anti-armor combat.[1] Its special EMP ability is entirely ineffective against infantry.