The 'Blueprint Gunfight Customs' that is currently live actually uses the normal Gunfight loadout / attachment combos.
It just uses the base look of the blueprint and blueprint attachment look if the loadout happens to contain it.
However, when I investigated why similar loadouts seem to keep getting selected, I found an issue, so thank you for the post!
I've submitted a fix for an upcoming patch so the M14/R9-0 won't show up all the time.