The 5.56mm assault machine gun requirement, intended for use by the “dismounted user” is the replacement effort of the L110 A2 Light Machine Gun (LMG), known as the Minimi in UK service ...
Heckler & Koch (H&K) is currently developing a 5.56×45 mm version of the HK421 light machine gun (LMG), which is currently chambered in 7.62×51 mm.