thought umarex/vfc had the trademarks for HK. There is a number of 416 RIS's out there and they don't all work/fit 101% with each other like JG & D-Boys don't go well together me thinks
slanted magwell - like M4 think 416's are more straighter at opening. Rest I haven't got a clue about. But pretty expensive tarted up M4 receiver
