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.
Heckler & Koch's short-stroke piston re-engineering of the AR-15 — adopted by France as its general-issue rifle, by the US Marine Corps as the M27 IAR, and by numerous special-forces units worldwide.
Overview
The HK416 is a 5.56×45 mm NATO assault rifle developed by the German manufacturer Heckler & Koch. It marries the external layout and handling of the AR-15/M4 family with a proprietary short-stroke gas piston system that replaces the direct-impingement action, dramatically improving reliability under fouling and adverse conditions. The platform has been fielded by elite units since 2004, became the standard French service rifle from 2017, and was adopted by the United States Marine Corps as the M27 Infantry Automatic Rifle, making it the Corps' universal infantry weapon. Special forces from Germany, Norway, the Netherlands and US SOCOM count it among their primary small arms.
Development
Heckler & Koch began developing the HK416 in the early 2000s, drawing on the short-stroke piston experience of the G36 and the external geometry of the M4 carbine. The rifle entered special-operations service in 2004, according to the Heckler & Koch official product page. The design directly addressed the M4's long-standing direct-impingement fouling problems, offering a “cleaner” operating system without sacrificing the ubiquitous AR-15 manual of arms. France selected the HK416F to replace the FAMAS in 2016, and deliveries of 117,000 rifles began the following year, according to LAI Publications. The US Marine Corps adopted the heavy-barrelled M27 IAR derivative in 2010 and, by 2018, had decided to equip every infantry marine with it, completing the transition away from the M4 USMC MARCORSYSCOM.
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