The TADEN was a British experimental light machine gun firing the .280 in (7 mm) intermediate round. Alongside the bullpup EM-2 rifle design, it formed part of a proposal to reequip the British Army with new small arms which would use a round smaller than the .303 inch which was shown to be impractical for use in a modern assault rifle. The TADEN would replace the Bren gun as the light machine gun and the Vickers machine gun as the medium machine gun. The EM-2 would replace the Lee–Enfield rifle and 9 mm submachine guns.