Delete solid within solid.

 From:  GuyLuke
11555.1 
Hi All.

I have designed this trigger guard but I've ended up with a edged shape within the loop of the guard that I want to remove. (RED)

I want that red shape deleted and replaced with the expected geometry of the rest of the trigger guard, as in I want the 3D shape to stay exactly the same but want the RED melted into it so the edges are all gone.

I tried to boolian Union and a few other things but nothing worked.

Thank you.

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