Maybe the seller had no knowledge of the carbines....period.
Looking back into his feedback...you can see he had bought a Garandicon from the seller blaze2000...and after a month tried to return it.
Possible.....he thought he was buying a carbine?

GunBroker.com - View User Feedback

He bought the NPM from Venomus66......and learned his lessons.. possibly the hard way.

Charlie