Razbam Harrier gun and Saitek X-65F with FSUIPC

Recently I decided to start assigning HOTAS commands through FSUIPC for the Razbam Harrier. I've got most everything working except the gun. I've got the gun selected in the HUD and the MFD in the stores display. I've got 300 rounds loaded, Master Arm is armed and the gun boxed in the MFD but the gun refuses to fire when I press the trigger. I understand that to fire weapons I'm supposed to have Cabin Alerts-Seatbelt assigned and I have been able to fire rockets from it but I've had no luck firing the gun. I've tried assigning the trigger (button 0 in FSUIPC) to the cabin alerts with no luck with the gun and I've tried the pickle assignment (button 1 in FSUIPC) as well with no luck.

Anyone?

-Damien