According to Ripster's wiki guides, to identify which Filco keyboards have 6KRO over USB and NKRO over PS2, you need to look for an N at the end of the model number.
The Filco Linear R doesn't have an N at the end of the model number. Does this mean it doesn't have NKRO? Seems a little strange that one of the most expensive Filco keyboards doesn't have NKRO while the cheaper Filcos have it?
Isn't the Linear R basically just a MJ2 tenkeyless with red switches?