I haven't seen the inside of a TC composit stock, but lots of them have a molded in rib top and bottom that is drilled and tapped for the buttplate/recoil pad. If you remove the recoil pad you should be able to see. If it has the ribs then all you have to do is redrill and tap, then put the holes in the right spots in the pad when you re-install and re-contour it.