Universal Machine Gun. Modular. Reliable. Superior.As the successor of the MG3, The HK121 opens a new era of universal belt fed 7.62 mm x 51 machine guns. Compared to others, the gas operated HK121 offers an intelligent and contemporary build standard, with numerous technical and ergonomic innovations. The mounting interface of the HK121 is compatible with MG3 mounts and tripods already in service. The universal HK121 can be used by dismounted infantry in the ground role, as well as for air defence or as a vehicle mounted/co axial machine gun.