This Is My Rifle: Episode 12 The M4 Carbine and M16A4 represent the evolution of the modern Marine rifleman, combining versatility, modularity, and precision for 21st-century warfare. Building on the legacy of the M16A2, the M16A4 added Picatinny rails, optics compatibility, and greater adaptability for different combat environments. Meanwhile, the M4 Carbine offered a lighter, shorter platform for close-quarters engagements without sacrificing accuracy, becoming the go-to weapon for countless M