Derf, as best I can tell from the picture (eyes are getting old and tired), the buttplate is definitely a "late Inland" type.... guess it matches everything else.
Please note that you posted some nice pictures, but everyone can not tell you about the manufacturer codes since most of the parts (and their stamped codes) are not included in your pictures. Almost everything on the carbine has an manufacturer stamp except for the springs and a very few of the smallest parts (plungers, hammer spring guides, etc). Half the fun is taking it apart, finding the codes and then dicovering what the codes mean...
Hope that helps...
Ed