Deadeye,
The "new" Breach Block and Extension Rod assembly eliminate the possibility of the extension rod being stopped by your face in the event of an out of battery discharge. Very nice.
Disassembly is by driving the link pivot pin out of the Breach Block, left to right. Slide the "rocker" down out of the Breach Block, paying attention to the way it came out. It only works "one way." Do the reverse for reassembly.
While you have it apart, consider cleaning up the firing pin and replacing the return spring with a light one. Also check the Breach Block end of the Extension Rod for fit in the back of the Breach Block. If it's tight or drags, fit and polish appropriately.
The change to the assembly is a welcome one!!
Coffinmaker