The Heckler & Koch HK416 is a gas-operated assault rifle chambered for the 5.56ÃÆ'Æ'Æ'ÃÆ'ââ'¬ '-45mm NATOcartridge. It is designed and manufactured by the German company Heckler & Koch.

Although the design is based on the AR-15 class of firearm (specifically the Colt M4 carbinefamily issued to the U.S. military), it uses a proprietary short-stroke, gas piston system from Heckler & Koch's earlier G36 family of rifles.

The HK416 is the standard assault rifle of the Norwegian Armed Forces and the United States Marine Corps(named M27), and it has been selected by the French Armed Forces to replace the FAMAS. Other users of the HK416 include the German Army and the Irish Army Ranger Wing, as well as the US Navy's SEAL Team Six, who used it to kill Osama Bin Laden in 2011.

The United States Army's Delta Force, at the request of R&D NCO Larry Vickers, collaborated with Heckler & Koch to develop a new carbine in the 1990s for use in close quarters combat. At this point, they were equipped with the Heckler & Koch MP5, whose 9 mm bullet was considered too weak, and the M4 Carbine, which was considered too large.During development, Heckler & Koch capitalized on experience gained developing the Bundeswehr's Heckler & Koch G36 assault rifle, the U.S. Army's XM8 rifle project (cancelled in 2005) and the British Armed Forces SA80 A2 upgrade programme. The project was originally called the Heckler & Koch M4, but this was changed in response to a trademark infringement suit filed by Colt Defense.

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