Magazine box won’t allow action to fit in stock

[Megastink]

I’ve tried two mag boxes in my McMillan stock and both boxes won’t allow the action to fit. The action sit on top of the mag box in the rear. Both magazines are sitting flush on the bottom of the mag well. When I sit the action into the stock without the mag box installed, it fits perfectly. I’ve attached a photo of the action sitting in the stock without the mag box installed, then two photos of the action sitting on the mag box. I could use some help figuring this out. Thank you!