4.6x30mm,_5.7x28mm,_.30_M1_Carbine October 19, 2012 at: 411 × 487 In: Heckler & Koch MP7: Not your father’s sub-machine gun Next → From left to right: 4.6×30mm (Hollow Point), 5.7×28mm, .30 Carbine. Photo courtesy of the Wikipedia Commons.