USA
M4 Carbine
The standard US carbine of the post-Cold-War era — a compact, 5.56 mm direct-impingement select-fire weapon that served across Afghanistan, Iraq and dozens of allied forces.
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HK416
The HK416 is Heckler & Koch's piston-driven re-engineering of the AR-15 platform — widely fielded as a special-forces carbine, France's standard rifle, and the US Marine Corps' M27 Infantry Automatic Rifle.