how to secondary fire?

in BC2 the vehicles. i see tanks and UAVs with Machines guns (Different from the one on top of the tank that needs to be man) and APC's with missiles. how do i activate those

Are you talking about the ones that you can use if you change position or did I totally miss the question :question:

Are you talking about the ones that you can use if you change position or did I totally miss the question :question:

forrma

nope.the ones you can use on the driver seat and the UAV machine gun

can someone just tell me what to press for secondary fire for UAV tank and APC? when your driving it

for the UAV u pressed R2 and it fired the Machine Gun.

Sometimes it works and sometimes it doesnt, I still cant figure out why it sometimes doesnt work.

I get lucky by pressing R2 and it fires the machine gun.