No 4 Forestock conversion

[Doco overboard]

I'm building up a rifle from parts and bought a Mk 2 forestock from an online vendor.
The wood arrives today and its brand new in wrapper. Green inside/beige exterior.(pics)
I know I have to patch a piece to the rear of the timber area so I want to check it out.

Anyway, I try to fit my no 4 body into the in-letting and theirs a wooden protrusion near the front right receiver reinforce that will not allow the body to drop in.

Question, is there a reason the additional wood is located in that particular area?
If someone could give a heads up why the additional material is there before I unnecessarily remove the offending piece that would be a great help.
I don't want to remove or destroy anything that's there for a specific purpose.
I can find another piece of wood if necessary, this ones pretty decent enough to leave alone if the need be.

Thanks for any replies-Brian

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