Watch this video of the 4th model in the HK416 New Generation Electric Gun Series from Tokyo Marui, the HK416 Delta Custom. This is a custom version of the HK416 and is used by the U.S. Army Delta Force or the 1st Special Forces Operational Detachment-Delta (1st SFOD-D) that conducts highly classified and complex missions. Being a New Generation Electric Gun (NEG), this has the electric blowback and simulated recoil features.