Heckler & Koch HK-416

The HK416 is an Assault Rifle designed and manufactured by Heckler & Koch. It is an improved version of the M4 carbine with many changes, most notably a new gas operating system from the G36.

The US Army's Delta Force collaborated with the German arms maker to develop the new carbine. Delta replaced its M4s with the HK416 in 2004 after tests revealed that the piston operating system significantly reduces malfunctions while increasing the life of parts