A news report about the USS Iowa gun turret explosion in 1989.
HK416 Assault Rifle Mud & Sand Test
The Heckler & Koch HK416 is an assault rifle/carbine designed and manufactured by Heckler & Koch. It is based on the AR-15 platform, and was originally conceived as an improvement to the Colt M4 carbine family issued to the U.S. military, with the notable inclusion of an HK-proprietary short-stroke gas piston system derived from the Heckler & Koch G36. Military and law enforcement customers can purchase a new upper receiver, buffer, and drive spring to refurbish existing AR-15s, or buy new complete HK416s.