Darren: Seems like I remember something about that s/n being a bit unusual. In that case, I bet they would be interested.
HDSledge: Regarding your data sheet, I usually give up when I get about that far on one! I still think you need to make corrections on the mag catch type and the barrel (chamber) skirt. The pictures of yours look identical to the ones on my 400K Inland - and I checked different boxes. I'm not 100% sure I'm correct, though. - Bob
As a suggestion, maybe just put 3/4" for the length measurement at the back of the receiver.