Craig,
The #2 has a sliding type. The shank is cut out for a stud screw on the left side of the action that holds the extractor in place & allows it to move fore & aft. The plate part of the extractor has an extension on the bottom side that engages the breach block when it's rolled open to extract the cartridge. My two #2's have this type & the Frank DeHaas single shot book does not talk about any variations, but with these old guns, anything is possible.
If you like the old classic single shots, the ASSRA forum (www.assra.com) is more the place to look, rather than benchrest central which is dedicated to modern benchrest. Another site that might interest you is the classic & single shot forum on doublegunshop.com (http://www.doublegunshop.com/forums/ubbthreads.php).
