I have just figured out that neither the front or rear action boss is contacting the inlet mount surface of the Oryx chassis.
And as Fuj' said above, the Oryx is a v-block type chassis except the V is not deep in the chassis like I expected like a Choate stock.
The V is a chamfer on the sides.
Dont know why it took me so long to figure this out.
Anyway, all is good.
Thanks everybody.
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