Did fabrique nationale make a 8MM?

Yes, Fabrique Nationale (FN) produced an 8mm rifle, specifically the FN Model 1924, which was a bolt-action rifle chambered for the 8x57mm Mauser cartridge. This model was part of FN's range of military firearms and was used by various countries in the early to mid-20th century. Additionally, FN manufactured other firearms in different calibers, but the 8mm Mauser was one of the notable cartridges used in their rifles.