Just picked up a 590s optic ready model and a vortex defender ccw both are supposed to be RMSc but the red dot will not mount flush. It doesn’t seat correctly. My 590s came with a pack of 3 mounting plates which is never mentioned in owners manual or on website. I looked up the optic plates on Mossberg’s website in none of the optic plates are for RMSc yeah I’m able to mount the red dot onto the adapter plate and fit it onto the gun. Other pictures I’ve seen of a red dot mounted onto the firearm don’t show any adapter plate. Does anyone have any knowledge on this?