I need to inverse mirror a plane

Ok I hope I can describe what I am trying to do.
I have a AR15 lower and have a buddy who would like for me to make him a drill jig. So I have am AR15 model in Fusion. How could I get the side profile geometry projected off to a new plane so I could mill a drill jig.
I also need to project the fire control group geometry.

Any advice help would be great...
Thanks

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Can you open the existing ar15 file and copy the sketches to a new part file? Then extrude it in the different direction for the jig?

Why don’t you create a new component (milling jig), join them with an negative offset then use the combine tool with the keep tool function checked? It is how you create soft jaws.

Youtube search for “soft jaws fusion 360” nyccnc has a great tutorial.