HK421 with ‘para' stock and 330 mm barrel. For illustrative purposes. (Janes/ Amael Kotlarski) Heckler & Koch (H&K) is currently developing a 5.56×45 mm version of the HK421 light machine gun ...

America’s 5.56 NATO and the Soviet Union’s 5.45x39 mm. This imprint is from a 20-round box of .224E2 ammunition. The experimental Winchester .224E1 cartridge (left) and E2 cartridges (right ...