Doesn't seem to be working - I've got 2 of them inserted in a Spidertron, stocked its inventory with basic (yellow) mags, I can see the module load up the ammo, but when I get near an enemy, it won't shoot. The lasers and rockets will activate as normal tho, so it's not a setting on the vehicle.
I've checked the various threads and the information page, but... nothing.