Look into the box: HK416 clone

The view is somewhat confusing because at first glance something doesn't seem right: Yes, it is a HK416 Upper on a M4 Lower. Which unit? Not known. At the front of the weapon, there is a KAC Supressor, behind it an AN/PEQ15 and an EOTech 553. The weapon light is an Insight VBL. An unknown handstopper is mounted on the rail at the front. Training with this weapon was conducted at Rockwell Tactical in the USA. Check out their FB page for more information.