The trigger guard you have is a "transitional" guard. It was meant to be coupled with the Accustock style DBM magazine frame. The TG is deeper in the front to accomodate the hardware, only the stocks were not meant for the DBM hardware, so these gurards were made to rectify an oversight.
Just use a standard trigger guard. You also might want to check the action screw spacing, it looks light that stock could be for a stagger feed.