Iver Johnson carbines:

[Sunray]

The issue with IJ Carbines is mostly about when the particular Carbine was made and by which of IJ's acquired companies. In 1986, most of 'em were on late model Universal receivers. Then on October 21, 1986, IJ filed for Chapter 11.
Everything you ever wanted to know about Carbines is being documented here. M1CarbinesInc.com
"...or bull pupping them..." More like cutting 'em down to 'Enforcer' size. Bikers in Montreal are alleged to have been doing that and our idiot government made Carbines restricted as a result back in 1978. You can't just change the stock and make a bull pup anyway.
Plainfield is alleged to have made M2 Carbines in the 1960's for export. Making a Carbine FA/select fire is not, by itself, going to cause it to blow up.
A WVSP armorer would only know about any Carbine if the West Virginia State Police issued 'em.