Hyperdouraku most probably got the first review of the Tokyo Marui HK416D DEVGRU Custom which was released in the middle of December 2013. Sporting the new generation electric blowback and recoil engine, this is based on the previously released HK416D but with different iron sights, stock, a vertical foregrip, and a suppressor.

Read the full review at Hyperdouraku.(In Japanese)