 After testing this prototype in 1948, the British Army urged FN to build additional prototypes, including one in bullpup configuration, chambered for their new .280 British [7x43mm] caliber intermediate cartridge.After evaluating the single bullpup prototype, FN decided to return instead to their original, conventional design for future production.In 1950, the United Kingdom presented the redesigned FN rifle and the British EM-2, both in .280 British calibre, to the United States for comparison testing against the favoured United States Army design of the time—Earle Harvey's T25.