As I was checking out my GTI folder again I took a closer look at the pivot area, between the blade and liners. It appears as if the blade is sandwiched between two (One on each side) phosphor bronze bushings. I don't know if they are solid bushings or with numerous holes like the bushings in CRK bushings.

The back of the handle uses barrel spacers for approx 2/3 of it's length with the final portion filled with a solid laminated (possibly G10 or Micarta) material.